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src/lib/youtube.ts

@@ -0,0 +1,114 @@
+/**
+ * YouTube OAuth and API Client
+ */
+
+export interface YouTubeTokenResponse {
+  access_token: string;
+  refresh_token?: string;
+  expires_in: number;
+  token_type: string;
+}
+
+export interface YouTubeUser {
+  userId: string;
+  displayName: string;
+  profileImageUrl: string;
+}
+
+/**
+ * Exchange authorization code for access token
+ */
+export async function getYoutubeAccessToken(
+  code: string,
+  clientId: string,
+  clientSecret: string,
+  redirectUri: string,
+): Promise<YouTubeTokenResponse> {
+  const params = new URLSearchParams({
+    code,
+    client_id: clientId,
+    client_secret: clientSecret,
+    redirect_uri: redirectUri,
+    grant_type: "authorization_code",
+  });
+
+  const response = await fetch("https://oauth2.googleapis.com/token", {
+    method: "POST",
+    body: params,
+    headers: {
+      "Content-Type": "application/x-www-form-urlencoded",
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(
+      `Failed to get YouTube access token: ${response.statusText}`,
+    );
+  }
+
+  return response.json();
+}
+
+/**
+ * Get YouTube user information
+ */
+export async function getYoutubeUser(
+  accessToken: string,
+): Promise<YouTubeUser> {
+  const response = await fetch(
+    "https://www.googleapis.com/youtube/v3/channels?part=snippet&mine=true",
+    {
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+      },
+    },
+  );
+
+  if (!response.ok) {
+    throw new Error(`Failed to get YouTube user: ${response.statusText}`);
+  }
+
+  const data = await response.json();
+
+  if (!data.items || data.items.length === 0) {
+    throw new Error("No YouTube channel found");
+  }
+
+  const channel = data.items[0];
+
+  return {
+    userId: channel.id,
+    displayName: channel.snippet.title,
+    profileImageUrl: channel.snippet.thumbnails?.default?.url || "",
+  };
+}
+
+/**
+ * Refresh YouTube access token
+ */
+export async function refreshYoutubeToken(
+  refreshToken: string,
+  clientId: string,
+  clientSecret: string,
+): Promise<YouTubeTokenResponse> {
+  const params = new URLSearchParams({
+    refresh_token: refreshToken,
+    client_id: clientId,
+    client_secret: clientSecret,
+    grant_type: "refresh_token",
+  });
+
+  const response = await fetch("https://oauth2.googleapis.com/token", {
+    method: "POST",
+    body: params,
+    headers: {
+      "Content-Type": "application/x-www-form-urlencoded",
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`Failed to refresh YouTube token: ${response.statusText}`);
+  }
+
+  return response.json();
+}