add parseSpotifyCallbackHashToToken utility to convert hash to Token

Author: adamint

src/commonMain/kotlin/com.adamratzman.spotify/SpotifyApi.kt

@@ -624,15 +624,16 @@ open class SpotifyClientApi internal constructor(
     /**
      * Whether the current access token allows access to scope [scope]
      */
-    fun hasScope(scope: SpotifyScope): Boolean = hasScopes(scope)
+    fun hasScope(scope: SpotifyScope): Boolean? = hasScopes(scope)
 
     /**
      * Whether the current access token allows access to all of the provided scopes
      */
-    fun hasScopes(scope: SpotifyScope, vararg scopes: SpotifyScope): Boolean =
-            !isTokenValid(false).isValid &&
-                    token.scopes.contains(scope) &&
-                    scopes.all { token.scopes.contains(it) }
+    fun hasScopes(scope: SpotifyScope, vararg scopes: SpotifyScope): Boolean? =
+            if (token.scopes == null) null
+            else !isTokenValid(false).isValid &&
+                    token.scopes?.contains(scope) == true &&
+                    scopes.all { token.scopes?.contains(it) == true }
 }
 
 

src/commonMain/kotlin/com.adamratzman.spotify/models/Authentication.kt

@@ -32,9 +32,9 @@ data class Token(
     @Transient
     var expiresAt: Long = getCurrentTimeMs() + expiresIn * 1000
     @Transient
-    var scopes: List<SpotifyScope> = scopeString?.let { str ->
+    var scopes: List<SpotifyScope>? = scopeString?.let { str ->
         str.split(" ").mapNotNull { scope -> SpotifyScope.values().find { it.uri.equals(scope, true) } }
-    } ?: listOf()
+    }
 
     fun shouldRefresh(): Boolean = getCurrentTimeMs() > expiresAt
 

src/jsMain/kotlin/com/adamratzman/spotify/utils/ImplicitGrant.kt

@@ -0,0 +1,26 @@
+package com.adamratzman.spotify.utils
+
+import com.adamratzman.spotify.SpotifyImplicitGrantApi
+import com.adamratzman.spotify.models.Token
+import org.w3c.dom.url.URLSearchParams
+import kotlin.browser.window
+
+/**
+ * Parse the current url into a valid [Token] to be used when instantiating a new [SpotifyImplicitGrantApi]
+ */
+fun parseSpotifyCallbackHashToToken() = parseSpotifyCallbackHashToToken(window.location.hash.substring(1))
+
+/**
+ * Parse the hash string into a valid [Token] to be used when instantiating a new [SpotifyImplicitGrantApi]
+ *
+ * @param hashString The Spotify hash string containing access_token, token_type, and expires_in.
+ */
+fun parseSpotifyCallbackHashToToken(hashString: String): Token {
+    val hash = URLSearchParams(hashString)
+
+    return Token(
+            hash.get("access_token") ?: throw IllegalStateException("access_token is not part of the hash!"),
+            hash.get("token_type") ?: throw IllegalStateException("token_type is not part of the hash!"),
+            hash.get("expires_in")?.toIntOrNull() ?: throw IllegalStateException("expires_in is not part of the hash!")
+    )
+}