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Android Signer Application nip
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greenart7c3
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86e44b75eb
495
100.md
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495
100.md
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# NIP-100
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## Android Signer Application
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`draft` `optional` `author:greenart7c3`
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This NIP describes a method for 2-way communication between a 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 the package name of the signer to your AndroidManifest.xml:
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```xml
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<queries>
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<package android:name="com.example.signer"/>
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</queries>
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```
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## Using Intents
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To get the result back from the Signer Appication 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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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:$content"))
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```
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* Set the Signer package name
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```kotlin
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intent.`package` = "com.example.signer"
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```
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### Methods
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- **get_public_key**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "get_public_key")
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context.startActivity(intent)
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```
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- result:
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- If the user approved intent it will return the **npub** in the signature field
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```kotlin
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val npub = intent.data?.getStringExtra("signature")
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```
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- **sign_event**
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- params:
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```kotlin
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val intent = Intent(Intent.ACTION_VIEW, Uri.parse("nostrsigner:$eventJson"))
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intent.`package` = "com.example.signer"
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intent.putExtra("type", "sign_event")
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// to 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", event.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**, **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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### 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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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 browsers url has limitations, so if you are using the returnType of **event** consider using the parameter **compressionType=gzip** that will return "Signer1" + Base 64 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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const intent = `intent:#Intent;scheme=nostrsigner;S.compressionType=none;S.returnType=signature;S.type=get_public_key;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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```
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- **sign_event**
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- params:
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```js
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const intent = `intent:${eventJson}#Intent;scheme=nostrsigner;S.compressionType=none;S.returnType=signature;S.type=sign_event;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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```
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- **nip04_encrypt**
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- params:
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```js
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const intent = `intent:${plainText}#Intent;scheme=nostrsigner;S.pubKey=${hex_pub_key};S.compressionType=none;S.returnType=signature;S.type=nip04_encrypt;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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```
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- **nip44_encrypt**
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- params:
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```js
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const intent = `intent:${plainText}#Intent;scheme=nostrsigner;S.pubKey=${hex_pub_key};S.compressionType=none;S.returnType=signature;S.type=nip44_encrypt;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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```
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- **nip04_decrypt**
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- params:
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```js
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const intent = `intent:${encryptedText}#Intent;scheme=nostrsigner;S.pubKey=${hex_pub_key};S.compressionType=none;S.returnType=signature;S.type=nip44_encrypt;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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```
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- **nip44_decrypt**
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- params:
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```js
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const intent = `intent:${encryptedText}#Intent;scheme=nostrsigner;S.pubKey=${hex_pub_key};S.compressionType=none;S.returnType=signature;S.type=nip44_decrypt;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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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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const intent = `intent:${eventJson}#Intent;scheme=nostrsigner;S.compressionType=none;S.returnType=signature;S.type=decrypt_zap_event;S.callbackUrl=https://example.com/?event=;end`;
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window.href = intent;
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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 = `intent:${encodedJson}#Intent;scheme=nostrsigner;S.compressionType=none;S.returnType=signature;S.type=sign_event;S.callbackUrl=https://example.com/?event=;end`;
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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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