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202
PennMobile/src/main/java/com/pennapps/labs/pennmobile/CampusExpressLoginFragment.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| package com.pennapps.labs.pennmobile | ||
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| import android.content.SharedPreferences | ||
| import android.net.Uri | ||
| import android.os.Build | ||
| import android.os.Bundle | ||
| import android.util.Log | ||
| import androidx.fragment.app.Fragment | ||
| import android.view.LayoutInflater | ||
| import android.view.View | ||
| import android.view.ViewGroup | ||
| import android.webkit.WebResourceRequest | ||
| import android.webkit.WebResourceResponse | ||
| import android.webkit.WebView | ||
| import android.webkit.WebViewClient | ||
| import android.widget.Button | ||
| import android.widget.LinearLayout | ||
| import android.widget.Toast | ||
| import androidx.fragment.app.FragmentTransaction | ||
| import androidx.preference.PreferenceManager | ||
| import com.pennapps.labs.pennmobile.api.CampusExpress | ||
| import com.pennapps.labs.pennmobile.classes.Account | ||
| import com.pennapps.labs.pennmobile.classes.CampusExpressAccessTokenResponse | ||
| import kotlinx.android.synthetic.main.fragment_login_webview.view.* | ||
| import org.apache.commons.lang3.RandomStringUtils | ||
| import retrofit.Callback | ||
| import retrofit.RetrofitError | ||
| import retrofit.client.Response | ||
| import java.security.MessageDigest | ||
| import java.util.* | ||
|
|
||
| // TODO: Rename parameter arguments, choose names that match | ||
| // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER | ||
| private const val ARG_PARAM1 = "param1" | ||
| private const val ARG_PARAM2 = "param2" | ||
|
|
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| /** | ||
| * A simple [Fragment] subclass. | ||
| * Use the [CampusExpressLoginFragment.newInstance] factory method to | ||
| * create an instance of this fragment. | ||
| */ | ||
| class CampusExpressLoginFragment : Fragment() { | ||
| lateinit var webView: WebView | ||
| lateinit var headerLayout: LinearLayout | ||
| lateinit var cancelButton: Button | ||
| lateinit var user: Account | ||
| private var mCampusExpress: CampusExpress? = null | ||
| private lateinit var mActivity: MainActivity | ||
| lateinit var sp: SharedPreferences | ||
| lateinit var codeChallenge: String | ||
| lateinit var codeVerifier: String | ||
| lateinit var state: String | ||
| lateinit var campusExpressAuthUrl: String | ||
| lateinit var clientID: String | ||
| lateinit var redirectUri: String | ||
|
|
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| override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, | ||
| savedInstanceState: Bundle?): View? { | ||
| return inflater.inflate(R.layout.fragment_campus_express_login, container, false) | ||
| } | ||
|
|
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| override fun onCreate(savedInstanceState: Bundle?) { | ||
| super.onCreate(savedInstanceState) | ||
| mCampusExpress = MainActivity.campusExpressInstance | ||
| mActivity = activity as MainActivity | ||
| sp = PreferenceManager.getDefaultSharedPreferences(mActivity) | ||
|
|
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| // These values are added to the BuildConfig at runtime, to allow GitHub Actions | ||
| // to build the app without pushing the secrets to GitHub | ||
| clientID = "5c09c08b240a56d22f06b46789d0528a" | ||
| redirectUri = "https://pennlabs.org/pennmobile/android/campus_express_callback/" | ||
| codeVerifier = RandomStringUtils.randomAlphanumeric(64) | ||
| codeChallenge = getCodeChallenge(codeVerifier) | ||
| state = getStateString() | ||
| campusExpressAuthUrl = "https://prod.campusexpress.upenn.edu/api/v1/oauth/authorize" | ||
| } | ||
|
|
||
| override fun onViewCreated(view: View, savedInstanceState: Bundle?) { | ||
| super.onViewCreated(view, savedInstanceState) | ||
| webView = view.findViewById(R.id.webView) | ||
| headerLayout = view.linear_layout | ||
| cancelButton = view.findViewById(R.id.cancel_button) | ||
| val uri = Uri.parse(campusExpressAuthUrl) | ||
| .buildUpon() | ||
| .appendQueryParameter("response_type", "code") | ||
| .appendQueryParameter("client_id", clientID) | ||
| .appendQueryParameter("state", state) | ||
| .appendQueryParameter("scope", "read") | ||
| .appendQueryParameter("code_challenge", codeChallenge) | ||
| .appendQueryParameter("code_challenge_method", "S256") | ||
| .appendQueryParameter("redirect_uri", redirectUri) | ||
| .build() | ||
| webView.loadUrl(uri.toString()) | ||
| val webSettings = webView.settings | ||
| webSettings.setJavaScriptEnabled(true) | ||
| webSettings.javaScriptCanOpenWindowsAutomatically = true; | ||
| webView.webViewClient = MyWebViewClient() | ||
|
|
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| cancelButton.setOnClickListener { | ||
| parentFragmentManager.popBackStack() | ||
| } | ||
|
|
||
| } | ||
|
|
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| inner class MyWebViewClient : WebViewClient() { | ||
|
|
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| override fun onReceivedHttpError(view: WebView?, request: WebResourceRequest?, errorResponse: WebResourceResponse?) { | ||
| super.onReceivedHttpError(view, request, errorResponse) | ||
| view?.visibility = View.INVISIBLE | ||
| headerLayout.visibility = View.INVISIBLE | ||
| } | ||
|
|
||
| override fun shouldOverrideUrlLoading(view: WebView?, url: String): Boolean { | ||
| if (url.contains("callback") && url.contains("?code=")) { | ||
| val urlArr = url.split("?code=", "&state=").toTypedArray() | ||
| val authCode = urlArr[1] | ||
| val clientState = urlArr[2] | ||
| initiateAuthentication(authCode) | ||
| } | ||
| return super.shouldOverrideUrlLoading(view, url) | ||
| } | ||
| } | ||
|
|
||
| private fun goToDiningInsights(refresh: Boolean) { | ||
| if(refresh) { | ||
| val fragment = DiningInsightsFragment() | ||
| parentFragmentManager.beginTransaction() | ||
| .replace(R.id.campus_express_page, fragment) | ||
| .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN) | ||
| .addToBackStack(null) | ||
| .commit() | ||
| } else { | ||
| parentFragmentManager.popBackStack() | ||
| } | ||
| } | ||
|
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| private fun initiateAuthentication(authCode: String) { | ||
| mCampusExpress?.getAccessToken(authCode, | ||
| "authorization_code", clientID, redirectUri, codeVerifier, | ||
| object : Callback<CampusExpressAccessTokenResponse> { | ||
|
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| override fun success(t: CampusExpressAccessTokenResponse?, response: Response?) { | ||
| if (response?.status == 200) { | ||
| val accessToken = t?.accessToken | ||
| val expiresIn = t?.expiresIn | ||
| val editor = sp.edit() | ||
| if (accessToken != null) { | ||
| editor.putString(mActivity.getString(R.string.campus_express_token),accessToken) | ||
| } | ||
| if (expiresIn != null) { | ||
| val currentDate = Date() | ||
| currentDate.time = currentDate.time + (expiresIn * 1000) | ||
| val expiresAt = currentDate.time | ||
| editor.putLong(mActivity.getString(R.string.campus_token_expires_in), expiresAt) | ||
| } | ||
| editor.apply() | ||
| goToDiningInsights(true) | ||
| } | ||
| } | ||
|
|
||
| override fun failure(error: RetrofitError) { | ||
| Log.e("Campus Webview", "Error fetching access token $error") | ||
| Toast.makeText(context, "Error getting campus express authorization", Toast.LENGTH_SHORT).show() | ||
| goToDiningInsights(false) | ||
| } | ||
| }) | ||
| } | ||
|
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| private fun getCodeChallenge(codeVerifier: String): String { | ||
|
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| // Hash the code verifier | ||
| val md = MessageDigest.getInstance("SHA-256") | ||
| val byteArr = md.digest(codeVerifier.toByteArray()) | ||
|
|
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| // Base-64 encode | ||
| var codeChallenge = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { | ||
| Base64.getEncoder().encodeToString(byteArr) | ||
| } else { | ||
| String( | ||
| android.util.Base64.encode(byteArr, android.util.Base64.DEFAULT), | ||
| Charsets.UTF_8) | ||
| } | ||
|
|
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| // Replace characters to make it web safe | ||
| codeChallenge = codeChallenge.replace("=", "") | ||
| codeChallenge = codeChallenge.replace("+", "-") | ||
| codeChallenge = codeChallenge.replace("/", "_") | ||
|
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| return codeChallenge | ||
| } | ||
|
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| private fun getStateString(): String { | ||
| var stateString = RandomStringUtils.randomAlphanumeric(64) | ||
|
|
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| // Replace characters to make it web safe | ||
| stateString = stateString.replace("=", "") | ||
| stateString = stateString.replace("+", "-") | ||
| stateString = stateString.replace("/", "_") | ||
|
|
||
| return stateString | ||
| } | ||
| } |
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