Get ConfigurableApi in;

Also allow configuring the access_token_verb;

refs fullstackreact#109, fullstackreact#102, fullstackreact#64

Author: Valery Buchinsky

android/src/main/java/io/fullstack/oauth/services/ConfigurableApi.java

@@ -0,0 +1,66 @@
+package com.github.scribejava.apis;
+
+import android.util.Log;
+
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.Verb;
+
+public class ConfigurableApi extends DefaultApi20 {
+
+    private String accessTokenEndpoint;
+
+    private String authorizationBaseUrl;
+
+    private Verb accessTokenVerb = Verb.GET;
+
+    protected ConfigurableApi() {
+    }
+
+    private static class InstanceHolder {
+        private static final ConfigurableApi INSTANCE = new ConfigurableApi();
+    }
+
+    public static ConfigurableApi instance() {
+        return InstanceHolder.INSTANCE;
+    }
+
+    public ConfigurableApi setAccessTokenEndpoint(String endpoint) {
+        accessTokenEndpoint = endpoint;
+        return this;
+    }
+
+    public ConfigurableApi setAuthorizationBaseUrl(String baseUrl) {
+        authorizationBaseUrl = baseUrl;
+        return this;
+    }
+
+    public ConfigurableApi setAccessTokenVerb(String verb) {
+        if (verb.equalsIgnoreCase("GET")) {
+            accessTokenVerb = Verb.GET;
+        } else if (verb.equalsIgnoreCase("POST")) {
+            accessTokenVerb = Verb.POST;
+        } else {
+            Log.e("ConfigurableApi", "Expected GET or POST string values for accessTokenVerb.");
+        }
+
+        return this;
+    }
+
+    @Override
+    public Verb getAccessTokenVerb() {
+        return accessTokenVerb;
+    }
+
+    @Override
+    public String getAccessTokenEndpoint() {
+        return accessTokenEndpoint;
+    }
+
+    @Override
+    protected String getAuthorizationBaseUrl() {
+        return authorizationBaseUrl;
+    }
+}