Feat/gasless

[SeniorZhai]

No description provided.

[Copilot]

Pull request overview

Adds “gasless transfer” support to the Web3 send flow by introducing new API endpoints/models, new signing type handling, and updating the wallet confirmation UI to display gasless fees and route gasless submissions.

Changes:

• Add gasless fee/prepare/submit API requests + responses and expose them via RouteService/Web3Repository/Web3ViewModel.
• Integrate gasless fee selection + validation into InputFragment, including Solana and EVM submission paths.
• Update browser wallet bottom sheet + Compose preview to support gasless transfer confirmations (custom fee display + custom PIN action).

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
app/src/main/java/one/mixin/android/web3/js/Web3Signer.kt	Adds gasless signing path for EVM message signing.
app/src/main/java/one/mixin/android/web3/js/JsSignMessage.kt	Introduces TYPE_GASLESS_TRANSFER and helper predicate.
app/src/main/java/one/mixin/android/ui/wallet/InputFragment.kt	Implements gasless fee selection, validation, and Solana/EVM submission flows.
app/src/main/java/one/mixin/android/ui/wallet/ClassicWalletFragment.kt	Refresh job now scoped to non-empty wallet id.
app/src/main/java/one/mixin/android/ui/home/web3/Web3ViewModel.kt	Adds gasless API wrappers and centralizes web3 private key derivation.
app/src/main/java/one/mixin/android/ui/home/web3/BrowserWalletBottomSheetDialogFragment.kt	Adds fee args + gasless handling and introduces a custom PIN action hook.
app/src/main/java/one/mixin/android/ui/home/web3/BrowserPage.kt	Shows gasless preview + fee token/amount display adjustments.
app/src/main/java/one/mixin/android/ui/home/MainActivity.kt	Adds (currently unused) gasless/demo helpers and models.
app/src/main/java/one/mixin/android/ui/common/PendingTransactionRefreshHelper.kt	Adjusts background refresh behavior for pending tx polling.
app/src/main/java/one/mixin/android/repository/Web3Repository.kt	Adds repository calls for gasless endpoints.
app/src/main/java/one/mixin/android/api/service/RouteService.kt	Adds web3/gasless/* endpoints.
app/src/main/java/one/mixin/android/api/response/web3/GaslessTxResponse.kt	Adds response models for gasless prepare (incl. EVM signing payload).
app/src/main/java/one/mixin/android/api/response/web3/GaslessFeeResponse.kt	Adds response models for gasless fee estimates.
app/src/main/java/one/mixin/android/api/request/web3/GaslessFeeRequest.kt	Adds request model for fee estimates.
app/src/main/java/one/mixin/android/api/request/web3/GaslessTxRequest.kt	Adds request model for gasless prepare.
app/src/main/java/one/mixin/android/api/request/web3/SubmitGaslessTxRequest.kt	Adds request model for gasless submit.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

customPinAction is invoked inside withContext(Dispatchers.Main.immediate), which forces the provided suspend callback to run on the main thread. In the gasless flow this callback performs network/signing work, so this can freeze the UI. Run the callback on the existing IO coroutine context and only switch to Main for updating step/preferences/UI state.

Suggested change

	step = Step.Loading
	errorInfo = null
	customPinAction?.let { action ->
	withContext(Dispatchers.Main.immediate) {
	action(pin)
	step = Step.Done
	defaultSharedPreferences.putLong(
	Constants.BIOMETRIC_PIN_CHECK,
	System.currentTimeMillis(),
	)
	}
	withContext(Dispatchers.Main.immediate) {
	step = Step.Loading
	errorInfo = null
	}
	customPinAction?.let { action ->
	action(pin)
	withContext(Dispatchers.Main.immediate) {
	step = Step.Done
	}
	defaultSharedPreferences.putLong(
	Constants.BIOMETRIC_PIN_CHECK,
	System.currentTimeMillis(),
	)

[Copilot]

EthGaslessTxPayload.signing.*.signType is parsed from the backend but currently ignored when producing userOpSignature / eip7702AuthSignature (both are always signed via TYPE_GASLESS_TRANSFER). If the backend varies signType (e.g., personal_sign vs typed data vs raw hash), this will generate invalid signatures. Use signType to select the appropriate signing algorithm (or remove the field if it’s truly constant).

[Copilot]

requireMixinData / requireMixinSuccess are added but not used anywhere in this file. Please either wire them into the new gasless/demo flows or remove them to avoid dead code and future confusion.

Suggested change

	private fun <T> requireMixinData(
	response: MixinResponse<T>,
	action: String,
	): T {
	if (!response.isSuccess) {
	throw IllegalStateException("$action failed: ${response.errorDescription}")
	}
	return requireNotNull(response.data) { "$action returned empty data" }
	}
	private fun requireMixinSuccess(
	response: MixinResponse<*>,
	action: String,
	) {
	if (!response.isSuccess) {
	throw IllegalStateException("$action failed: ${response.errorDescription}")
	}
	}

[Copilot]

Eip7702GaslessDemoArgs and Eip7702GaslessDemoResult are currently unused. If they’re only for local testing, consider removing them or guarding them behind a debug-only flag/source set so they don’t ship as dead production code.

Suggested change

	private data class Eip7702GaslessDemoArgs(
	val from: String?,
	val to: String,
	val assetId: String,
	val amount: String,
	val chainId: String,
	val feeAssetId: String?,
	)
	private data class Eip7702GaslessDemoResult(
	val from: String,
	val to: String,
	val assetId: String,
	val amount: String,
	val chainId: String,
	val feeAssetId: String,
	val userOpSignType: String,
	val userOpSignature: String,
	val eip7702Required: Boolean,
	val eip7702AuthSignature: String?,
	)