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543 lines
16 KiB
Markdown
543 lines
16 KiB
Markdown
NIP-55
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======
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Android Signer Application
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--------------------------
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`draft` `optional`
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This NIP describes a method for 2-way communication between an Android signer and any Nostr client on Android. The Android signer is an Android Application and the client can be a web client or an Android application.
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# Usage for Android applications
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The Android signer uses Intents and Content Resolvers to communicate between applications.
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To be able to use the Android signer in your application you should add this to your AndroidManifest.xml:
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```xml
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<queries>
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<intent>
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<action android:name="android.intent.action.VIEW" />
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<category android:name="android.intent.category.BROWSABLE" />
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<data android:scheme="nostrsigner" />
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</intent>
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</queries>
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```
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Then you can use this function to check if there's a signer application installed:
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```kotlin
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fun isExternalSignerInstalled(context: Context): Boolean {
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val intent =
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Intent().apply {
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action = Intent.ACTION_VIEW
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data = Uri.parse("nostrsigner:")
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}
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val infos = context.packageManager.queryIntentActivities(intent, 0)
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return infos.size > 0
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}
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```
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## Using Intents
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To get the result back from the Signer Application you should use `registerForActivityResult` or `rememberLauncherForActivityResult` in Kotlin. If you are using another framework check the documentation of your framework or a third party library to get the result.
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```kotlin
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val launcher = rememberLauncherForActivityResult(
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contract = ActivityResultContracts.StartActivityForResult(),
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onResult = { result ->
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if (result.resultCode != Activity.RESULT_OK) {
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Toast.makeText(
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context,
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"Sign request rejected",
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Toast.LENGTH_SHORT
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).show()
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} else {
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val signature = activityResult.data?.getStringExtra("signature")
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// Do something with signature ...
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}
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}
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)
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```
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Create the Intent using the **nostrsigner** scheme:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$content"))
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```
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Set the Signer package name:
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```kotlin
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intent.`package` = "com.example.signer"
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```
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Send the Intent:
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```kotlin
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launcher.launch(intent)
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```
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### Methods
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- **get_public_key**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "get_public_key")
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// You can send some default permissions for the user to authorize for ever
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val permissions = listOf(
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Permission(
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type = "sign_event",
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kind = 22242
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),
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Permission(
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type = "nip44_decrypt"
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)
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)
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intent.putExtra("permissions", permissions.toJson())
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **npub** in the signature field
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```kotlin
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val npub = intent.data?.getStringExtra("signature")
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// The package name of the signer application
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val packageName = intent.data?.getStringExtra("package")
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```
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- **sign_event**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$eventJson"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "sign_event")
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// To handle results when not waiting between intents
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intent.putExtra("id", event.id)
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// Send the current logged in user npub
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intent.putExtra("current_user", npub)
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **signature**, **id** and **event** fields
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```kotlin
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val signature = intent.data?.getStringExtra("signature")
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// The id you sent
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val id = intent.data?.getStringExtra("id")
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val signedEventJson = intent.data?.getStringExtra("event")
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```
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- **nip04_encrypt**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$plaintext"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "nip04_encrypt")
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// to control the result in your application in case you are not waiting the result before sending another intent
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intent.putExtra("id", "some_id")
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// Send the current logged in user npub
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intent.putExtra("current_user", account.keyPair.pubKey.toNpub())
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// Send the hex pubKey that will be used for encrypting the data
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intent.putExtra("pubKey", pubKey)
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **signature** and **id** fields
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```kotlin
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val encryptedText = intent.data?.getStringExtra("signature")
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// the id you sent
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val id = intent.data?.getStringExtra("id")
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```
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- **nip44_encrypt**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$plaintext"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "nip44_encrypt")
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// to control the result in your application in case you are not waiting the result before sending another intent
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intent.putExtra("id", "some_id")
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// Send the current logged in user npub
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intent.putExtra("current_user", account.keyPair.pubKey.toNpub())
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// Send the hex pubKey that will be used for encrypting the data
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intent.putExtra("pubKey", pubKey)
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **signature** and **id** fields
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```kotlin
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val encryptedText = intent.data?.getStringExtra("signature")
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// the id you sent
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val id = intent.data?.getStringExtra("id")
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```
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- **nip04_decrypt**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$encryptedText"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "nip04_decrypt")
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// to control the result in your application in case you are not waiting the result before sending another intent
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intent.putExtra("id", "some_id")
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// Send the current logged in user npub
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intent.putExtra("current_user", account.keyPair.pubKey.toNpub())
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// Send the hex pubKey that will be used for decrypting the data
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intent.putExtra("pubKey", pubKey)
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **signature** and **id** fields
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```kotlin
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val plainText = intent.data?.getStringExtra("signature")
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// the id you sent
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val id = intent.data?.getStringExtra("id")
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```
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- **nip44_decrypt**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$encryptedText"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "nip04_decrypt")
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// to control the result in your application in case you are not waiting the result before sending another intent
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intent.putExtra("id", "some_id")
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// Send the current logged in user npub
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intent.putExtra("current_user", account.keyPair.pubKey.toNpub())
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// Send the hex pubKey that will be used for decrypting the data
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intent.putExtra("pubKey", pubKey)
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **signature** and **id** fields
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```kotlin
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val plainText = intent.data?.getStringExtra("signature")
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// the id you sent
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val id = intent.data?.getStringExtra("id")
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```
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- **decrypt_zap_event**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$eventJson"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "decrypt_zap_event")
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// to control the result in your application in case you are not waiting the result before sending another intent
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intent.putExtra("id", "some_id")
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// Send the current logged in user npub
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intent.putExtra("current_user", account.keyPair.pubKey.toNpub())
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **signature** and **id** fields
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```kotlin
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val eventJson = intent.data?.getStringExtra("signature")
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// the id you sent
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val id = intent.data?.getStringExtra("id")
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```
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## Using Content Resolver
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To get the result back from Signer Application you should use contentResolver.query in Kotlin. If you are using another framework check the documentation of your framework or a third party library to get the result.
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If the user did not check the "remember my choice" option, the npub is not in Signer Application or the signer type is not recognized the `contentResolver` will return null
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For the SIGN_EVENT type Signer Application returns two columns "signature" and "event". The column event is the signed event json
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For the other types Signer Application returns the column "signature"
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If the user chose to always reject the event, signer application will return the column "rejected" and you should not open signer application
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### Methods
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- **get_public_key**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.GET_PUBLIC_KEY"),
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listOf("login"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **npub** in the signature column
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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if (index < 0) return
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val npub = it.getString(index)
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}
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```
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- **sign_event**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.SIGN_EVENT"),
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listOf("$eventJson", "", "${logged_in_user_npub}"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **signature** and the **event** columns
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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val indexJson = it.getColumnIndex("event")
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val signature = it.getString(index)
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val eventJson = it.getString(indexJson)
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}
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```
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- **nip04_encrypt**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.NIP04_ENCRYPT"),
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listOf("$plainText", "${hex_pub_key}", "${logged_in_user_npub}"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **signature** column
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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val encryptedText = it.getString(index)
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}
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```
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- **nip44_encrypt**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.NIP44_ENCRYPT"),
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listOf("$plainText", "${hex_pub_key}", "${logged_in_user_npub}"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **signature** column
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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val encryptedText = it.getString(index)
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}
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```
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- **nip04_decrypt**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.NIP04_DECRYPT"),
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listOf("$encryptedText", "${hex_pub_key}", "${logged_in_user_npub}"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **signature** column
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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val encryptedText = it.getString(index)
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}
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```
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- **nip44_decrypt**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.NIP44_DECRYPT"),
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listOf("$encryptedText", "${hex_pub_key}", "${logged_in_user_npub}"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **signature** column
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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val encryptedText = it.getString(index)
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}
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```
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- **decrypt_zap_event**
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- params:
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```kotlin
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val result = context.contentResolver.query(
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Uri.parse("content://com.example.signer.DECRYPT_ZAP_EVENT"),
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listOf("$eventJson", "", "${logged_in_user_npub}"),
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null,
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null,
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null
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)
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```
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- result:
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- Will return the **signature** column
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```kotlin
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if (result == null) return
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if (result.moveToFirst()) {
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val index = it.getColumnIndex("signature")
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val eventJson = it.getString(index)
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}
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```
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# Usage for Web Applications
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You should consider using [NIP-46: Nostr Connect](46.md), [Nostr login](https://github.com/nostrband/nostr-login) or (window.nostr.js)[https://github.com/fiatjaf/window.nostr.js] for a better experience for web applications. When using this approach the web app can't call the signer in background so the user will see a popup for every event you try to sign.
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Since web applications can't receive a result from the intent, you should add a modal to paste the signature or the event json or create a callback url.
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If you send the callback url parameter, Signer Application will send the result to the url.
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If you don't send a callback url, Signer Application will copy the result to the clipboard.
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You can configure the `returnType` to be **signature** or **event**.
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Android intents and browser urls have limitations, so if you are using the `returnType` of **event** consider using the parameter **compressionType=gzip** that will return "Signer1" + Base64 gzip encoded event json
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## Methods
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- **get_public_key**
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- params:
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```js
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window.href = `nostrsigner:?compressionType=none&returnType=signature&type=get_public_key&callbackUrl=https://example.com/?event=`;
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```
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- **sign_event**
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- params:
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```js
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window.href = `nostrsigner:${eventJson}?compressionType=none&returnType=signature&type=sign_event&callbackUrl=https://example.com/?event=`;
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```
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- **nip04_encrypt**
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- params:
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```js
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window.href = `nostrsigner:${plainText}?pubKey=${hex_pub_key}&compressionType=none&returnType=signature&type=nip04_encrypt&callbackUrl=https://example.com/?event=`;
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```
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- **nip44_encrypt**
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- params:
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```js
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window.href = `nostrsigner:${plainText}?pubKey=${hex_pub_key}&compressionType=none&returnType=signature&type=nip44_encrypt&callbackUrl=https://example.com/?event=`;
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```
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- **nip04_decrypt**
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- params:
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```js
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window.href = `nostrsigner:${encryptedText}?pubKey=${hex_pub_key}&compressionType=none&returnType=signature&type=nip04_decrypt&callbackUrl=https://example.com/?event=`;
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```
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- **nip44_decrypt**
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- params:
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```js
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window.href = `nostrsigner:${encryptedText}?pubKey=${hex_pub_key}&compressionType=none&returnType=signature&type=nip44_decrypt&callbackUrl=https://example.com/?event=`;
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```
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- **decrypt_zap_event**
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- params:
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```js
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window.href = `nostrsigner:${eventJson}?compressionType=none&returnType=signature&type=decrypt_zap_event&callbackUrl=https://example.com/?event=`;
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```
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## Example
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```js
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<h1>Test</h1>
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<script>
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window.onload = function() {
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var url = new URL(window.location.href);
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var params = url.searchParams;
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if (params) {
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var param1 = params.get("event");
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if (param1) alert(param1)
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}
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let json = {
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kind: 1,
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content: "test"
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}
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let encodedJson = encodeURIComponent(JSON.stringify(json))
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var newAnchor = document.createElement("a");
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newAnchor.href = `nostrsigner:${encodedJson}?compressionType=none&returnType=signature&type=sign_event&callbackUrl=https://example.com/?event=`;
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newAnchor.textContent = "Open External Signer";
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document.body.appendChild(newAnchor)
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}
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</script>
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</body>
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</html>
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```
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