1 files changed, 184 insertions, 0 deletions
diff --git a/src/services/SocialLinkingService.ts b/src/services/SocialLinkingService.ts
new file mode 100644
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--- /dev/null
+++ b/src/services/SocialLinkingService.ts
@@ -0,0 +1,184 @@
+import AsyncStorage from '@react-native-community/async-storage';
+import {Alert} from 'react-native';
+import InAppBrowser from 'react-native-inappbrowser-reborn';
+import {
+  LINKED_SOCIALS_ENDPOINT,
+  LINK_FB_ENDPOINT,
+  LINK_FB_OAUTH,
+  LINK_IG_ENDPOINT,
+  LINK_IG_OAUTH,
+  LINK_SNAPCHAT_ENDPOINT,
+  LINK_TIKTOK_ENDPOINT,
+  LINK_TWITTER_ENDPOINT,
+  LINK_TWITTER_OAUTH,
+} from '../constants';
+
+// A list of endpoint strings for all the integrated socials
+export const integratedEndpoints: {[social: string]: [string, string]} = {
+  Instagram: [LINK_IG_OAUTH, LINK_IG_ENDPOINT],
+  Facebook: [LINK_FB_OAUTH, LINK_FB_ENDPOINT],
+  Twitter: [LINK_TWITTER_OAUTH, LINK_TWITTER_ENDPOINT],
+};
+
+export const nonIntegratedEndponits: {[social: string]: string} = {
+  Snapchat: LINK_SNAPCHAT_ENDPOINT,
+  TikTok: LINK_TIKTOK_ENDPOINT,
+};
+
+export const registerNonIntegratedSocialLink: (
+  socialType: string,
+  username: string,
+) => Promise<boolean> = async (socialType, username) => {
+  if (!(socialType in nonIntegratedEndponits)) {
+    return false;
+  }
+  try {
+    const user_token = await AsyncStorage.getItem('token');
+    const response = await fetch(nonIntegratedEndponits[socialType], {
+      method: 'POST',
+      headers: {
+        Authorization: `Token ${user_token}`,
+      },
+      body: JSON.stringify({
+        username: username,
+      }),
+    });
+    return response.status === 200;
+  } catch (error) {
+    console.log(error);
+    return false;
+  }
+};
+
+// We have already received the short-lived token (callback_data), sending it
+// to backend to exchange for and store the long-lived token.
+export const registerIntegratedSocialLink: (
+  callback_data: string,
+  user_token: string,
+  socialType: string,
+) => Promise<boolean> = async (callback_data, user_token, socialType) => {
+  if (!(socialType in integratedEndpoints)) {
+    return false;
+  }
+  const response = await fetch(integratedEndpoints[socialType][1], {
+    method: 'POST',
+    headers: {
+      Authorization: `Token ${user_token}`,
+    },
+    body: JSON.stringify({
+      callback_url: callback_data,
+    }),
+  });
+  if (!(response.status === 201)) {
+    console.log(await response.json());
+  }
+  return response.status === 201;
+};
+
+// Twitter is a special case since they use OAuth1, we will need to request
+// for a request_token before we can begin browser signin.
+export const getTwitterRequestToken: (
+  user_token: string,
+) => Promise<string> = async (user_token) => {
+  const response = await fetch(integratedEndpoints.Twitter[0], {
+    method: 'GET',
+    headers: {
+      Authorization: `Token ${user_token}`,
+    },
+  });
+  return response.url;
+};
+
+// one stop shop for handling all browser sign-in social linkings
+export const handlePressForAuthBrowser: (
+  socialType: string,
+) => Promise<boolean> = async (socialType: string) => {
+  try {
+    if (!(socialType in integratedEndpoints)) {
+      Alert.alert('Coming soon!');
+      return false;
+    }
+
+    if (!(await InAppBrowser.isAvailable())) {
+      // Okay... to open an external browser and have it link back to
+      // the app is a bit tricky, we will need to have navigation routes
+      // setup for this screen and have it hooked up.
+      // See https://github.com/proyecto26/react-native-inappbrowser#authentication-flow-using-deep-linking
+      // Though this isn't the end of the world, from the documentation,
+      // the in-app browser should be supported from iOS 11, which
+      // is about 98.5% of all iOS devices in the world.
+      // See https://support.apple.com/en-gb/HT209574
+      Alert.alert(
+        'Sorry! Your device was unable to open a browser to let you sign-in! 😔',
+      );
+      return false;
+    }
+
+    let url = integratedEndpoints[socialType][0];
+    const user_token = await AsyncStorage.getItem('token');
+
+    if (!user_token) {
+      throw 'Unable to get user token';
+    }
+
+    // We will need to do an extra step for twitter sign-in
+    if (socialType === 'Twitter') {
+      url = await getTwitterRequestToken(user_token);
+    }
+
+    return await InAppBrowser.openAuth(url, 'taggid://callback', {
+      ephemeralWebSession: true,
+    })
+      .then(async (response) => {
+        if (response.type === 'success' && response.url) {
+          const success = await registerIntegratedSocialLink(
+            response.url,
+            user_token,
+            socialType,
+          );
+          if (!success) {
+            throw 'Unable to register with backend';
+          }
+          Alert.alert(`Successfully linked ${socialType} 🎉`);
+          return true;
+        } else {
+          throw 'Error from Oauth API';
+        }
+      })
+      .catch((error) => {
+        console.log(error);
+        Alert.alert(
+          `Something went wrong, we can't link with ${socialType} 😔`,
+        );
+        return false;
+      });
+  } catch (error) {
+    console.log(error);
+    Alert.alert(`Something went wrong, we can't link with ${socialType} 😔`);
+  }
+  return false;
+};
+
+// get all the linked socials from backend as an array
+export const getLinkedSocials: (user_id: string) => Promise<string[]> = async (
+  user_id: string,
+) => {
+  try {
+    const user_token = await AsyncStorage.getItem('token');
+    const response = await fetch(`${LINKED_SOCIALS_ENDPOINT}${user_id}/`, {
+      method: 'GET',
+      headers: {
+        Authorization: 'Token ' + user_token,
+      },
+    });
+    const body = await response.json();
+    if (response.status !== 200) {
+      console.log(body);
+      throw 'Unable to fetch from server';
+    }
+    return body.linked_socials || [];
+  } catch (error) {
+    console.log(error);
+    return [];
+  }
+};