نماذج ترميز Python على App Engine

تشرح نماذج أكواد Python التالية كيفية استخدام App Engine لإجراء استدعاءات YouTube Data API (الإصدار 3). يمكنك تنزيل عيّنات التعليمات البرمجية هذه من مستودعات نماذج رمز Python في Google App Engine على GitHub.

المتطلبات الأساسية

يجب إعداد مشروع في وحدة التحكم في واجهة Google API والحصول على مفتاح واجهة برمجة تطبيقات لتتمكن من تشغيل نماذج الرموز أدناه. في الوقت الحالي، يحدِّد كل مشروع متغيّر API_KEY تم ضبطه على القيمة REPLACE_ME. عليك استبدال هذه القيمة بمفتاح واجهة برمجة التطبيقات الخاص بك لتتمكّن من تشغيل النماذج.

ملاحظة مهمّة: لتشغيل كلّ هذه الأمثلة، يجب تفعيل YouTube Data API (الإصدار 3) وFreebase API للمشروع المرتبط بمفتاح واجهة برمجة التطبيقات. إذا كان تطبيقك يصل إلى بيانات القناة أو المستخدم الخاص، ستحتاج أيضًا إلى معرِّف عميل OAuth 2.0.

عيّنات تعليمات برمجية

البحث حسب الكلمة الرئيسية

يستدعي نموذج الرمز أدناه طريقة search.list لواجهة برمجة التطبيقات لاسترداد نتائج البحث المرتبطة بكلمة رئيسية معيّنة.

import os
import urllib
import webapp2
import jinja2

from apiclient.discovery import build
from optparse import OptionParser

JINJA_ENVIRONMENT = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
    extensions=['jinja2.ext.autoescape'])

# Set DEVELOPER_KEY to the "API key" value from the Google Developers Console:
# https://console.developers.google.com/project/_/apiui/credential
# Please ensure that you have enabled the YouTube Data API for your project.
DEVELOPER_KEY = "REPLACE_ME"
YOUTUBE_API_SERVICE_NAME = "youtube"
YOUTUBE_API_VERSION = "v3"

class MainHandler(webapp2.RequestHandler):
   
   def get(self):
        if DEVELOPER_KEY == "REPLACE_ME":
          self.response.write("""You must set up a project and get an API key
                                 to run this project.  Please visit 
				 <landing page> to do so."""
        else:
          youtube = build(
            YOUTUBE_API_SERVICE_NAME, 
            YOUTUBE_API_VERSION, 
            developerKey=DEVELOPER_KEY)
          search_response = youtube.search().list(
            q="Hello",
            part="id,snippet",
            maxResults=5
          ).execute()
        
          videos = []
          channels = []
          playlists = []
        
          for search_result in search_response.get("items", []):
            if search_result["id"]["kind"] == "youtube#video":
                videos.append("%s (%s)" % (search_result["snippet"]["title"], 
                  search_result["id"]["videoId"]))
            elif search_result["id"]["kind"] == "youtube#channel":
                channels.append("%s (%s)" % (search_result["snippet"]["title"], 
                  search_result["id"]["channelId"]))
            elif search_result["id"]["kind"] == "youtube#playlist":
                playlists.append("%s (%s)" % (search_result["snippet"]["title"], 
                  search_result["id"]["playlistId"]))
        
          template_values = {
           'videos': videos,
           'channels': channels,
           'playlists': playlists
          }
       
	  self.response.headers['Content-type'] = 'text/plain' 
          template = JINJA_ENVIRONMENT.get_template('index.html')
          self.response.write(template.render(template_values))
        
app = webapp2.WSGIApplication([
  ('/.*', MainHandler),
], debug=True)

البحث حسب الموضوع

يستدعي نموذج الرمز أدناه طريقة search.list لواجهة برمجة التطبيقات لاسترداد نتائج البحث المرتبطة بموضوع Freebase معيّن.

import os
import urllib
import webapp2
import jinja2

from apiclient.discovery import build
from optparse import OptionParser

import json

JINJA_ENVIRONMENT = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
    extensions=['jinja2.ext.autoescape'])

REGISTRATION_INSTRUCTIONS = """
    You must set up a project and get an API key to run this code. Please see
    the instructions for creating a project and a key at <a
    href="https://developers.google.com/youtube/registering_an_application"
    >https://developers.google.com/youtube/registering_an_application</a>.
    <br><br>
    Make sure that you have enabled the YouTube Data API (v3) and the Freebase
    API for your project."""

# Set API_KEY to the "API key" value from the Google Developers Console:
# https://console.developers.google.com/project/_/apiui/credential
# Please ensure that you have enabled the YouTube Data API and Freebase API
# for your project.
API_KEY = "REPLACE_ME"
YOUTUBE_API_SERVICE_NAME = "youtube"
YOUTUBE_API_VERSION = "v3"
FREEBASE_SEARCH_URL = "https://www.googleapis.com/freebase/v1/search?%s"
QUERY_TERM = "dog"

class MainHandler(webapp2.RequestHandler):

  def get(self):
    if API_KEY == 'REPLACE_ME':
      self.response.write(REGISTRATION_INSTRUCTIONS)
    else:
      # Present a list of Freebase topic IDs for the query term
      self.list_topics(QUERY_TERM)

  def list_topics(self, QUERY_TERM):
    # Retrieve a list of Freebase topics associated with the query term
    freebase_params = dict(query=QUERY_TERM, key=API_KEY)
    freebase_url = FREEBASE_SEARCH_URL % urllib.urlencode(freebase_params)
    freebase_response = json.loads(urllib.urlopen(freebase_url).read())

    if len(freebase_response["result"]) == 0:
      exit("No matching terms were found in Freebase.")

    # Create a page that shows a select box listing the topics.
    # When the user selects a topic and submits the form, the
    # 'post' method below will handle the form submission and
    # retrieve videos for the selected topic.
    select_topic_page = ('''
        <html>
          <body>
            <p>The following topics were found:</p>
            <form method="post">
              <select name="topic">
    ''')
    for result in freebase_response["result"]:
      select_topic_page += ('<option value="' + result["mid"] + '">' +
                            result.get("name", "Unknown") + '</option>')

    select_topic_page += '''
              </select>
              <p><input type="submit" /></p>
            </form>
          </body>
        </html>
    '''

    # Display the HTML page listing the topic choices.
    self.response.out.write(select_topic_page)

  def post(self):
    topic_id = self.request.get('topic')

    # Service for calling the YouTube API
    youtube = build(YOUTUBE_API_SERVICE_NAME,
                    YOUTUBE_API_VERSION,
                    developerKey=API_KEY)

    # Execute the search request using default query term and retrieved topic.
    search_response = youtube.search().list(
      part = 'id,snippet',
      type = 'video',
      topicId = topic_id
    ).execute()

    videos = []

    for search_result in search_response.get("items", []):
      videos.append(search_result)

    template_values = {
      'videos': videos
    }

    self.response.headers['Content-type'] = 'text/html'
    template = JINJA_ENVIRONMENT.get_template('index.html')
    self.response.write(template.render(template_values))

app = webapp2.WSGIApplication([
  ('/.*', MainHandler),
], debug=True)

استرداد الفيديوهات المحمّلة إلى قناة

يستدعي نموذج الرمز أدناه طريقة playlistItems.list لواجهة برمجة التطبيقات لاسترداد قائمة فيديوهات تم تحميلها إلى قناة محدّدة. يمكن التعرّف على القناة من خلال معرّف القناة أو اسمها. يطلب الرمز أيضًا الطريقة channels.list لاسترداد معرّف قائمة التشغيل الذي يحدّد الفيديوهات المحمّلة إلى القناة.

import os
import urllib
import webapp2
import jinja2

from apiclient.discovery import build
from optparse import OptionParser

import json

JINJA_ENVIRONMENT = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
    extensions=['jinja2.ext.autoescape'])

REGISTRATION_INSTRUCTIONS = """
    You must set up a project and get an API key to run this code. Please see
    the instructions for creating a project and a key at <a
    href="https://developers.google.com/youtube/registering_an_application"
    >https://developers.google.com/youtube/registering_an_application</a>.
    <br><br>
    Make sure that you have enabled the YouTube Data API (v3) and the Freebase
    API for your project."""

# Set API_KEY to the "API key" value from the Google Developers Console:
# https://console.developers.google.com/project/_/apiui/credential
# Please ensure that you have enabled the YouTube Data API and Freebase API
# for your project.
API_KEY = "REPLACE_ME"
YOUTUBE_API_SERVICE_NAME = "youtube"
YOUTUBE_API_VERSION = "v3"
FREEBASE_SEARCH_URL = "https://www.googleapis.com/freebase/v1/search?%s"
QUERY_TERM = "dog"

class MainHandler(webapp2.RequestHandler):

  def get(self):
    if API_KEY == 'REPLACE_ME':
      self.response.write(REGISTRATION_INSTRUCTIONS)
    else:
      # Present a list of Freebase topic IDs for the query term
      self.request_channel()

  def request_channel(self):
    # Display a text box where the user can enter a channel name or
    # channel ID.
    select_channel_page = '''
        <html>
          <body>
            <p>Which channel's videos do you want to see?</p>
            <form method="post">
              <p>
                <select name="channel_type">
                  <option value="id">Channel ID</option>
                  <option value="name">Channel name</option>
                </select>  
                <input name="channel" size="30">
              </p>
              <p><input type="submit" /></p>
            </form>
          </body>
        </html>
    '''

    # Display the HTML page that shows the form.
    self.response.out.write(select_channel_page)

  def post(self):
    # Service for calling the YouTube API
    youtube = build(YOUTUBE_API_SERVICE_NAME,
                    YOUTUBE_API_VERSION,
                    developerKey=API_KEY)

    # Use form inputs to create request params for channel details
    channel_type = self.request.get('channel_type')
    channels_response = None
    if channel_type == 'id':
      channels_response = youtube.channels().list(
          id=self.request.get('channel'),
          part='snippet,contentDetails'
      ).execute()
    else:
      channels_response = youtube.channels().list(
          forUsername=self.request.get('channel'),
          part='snippet,contentDetails'
      ).execute()

    channel_name = ''
    videos = []

    for channel in channels_response['items']:
      uploads_list_id = channel['contentDetails']['relatedPlaylists']['uploads']
      channel_name = channel['snippet']['title']
      
      next_page_token = ''
      while next_page_token is not None:
        playlistitems_response = youtube.playlistItems().list(
            playlistId=uploads_list_id,
            part='snippet',
            maxResults=50,
            pageToken=next_page_token
        ).execute()

        for playlist_item in playlistitems_response['items']:
          videos.append(playlist_item)
          
        next_page_token = playlistitems_response.get('tokenPagination', {}).get(
            'nextPageToken')
        
        if len(videos) > 100:
          break

    template_values = {
      'channel_name': channel_name,
      'videos': videos
    }

    self.response.headers['Content-type'] = 'text/html'
    template = JINJA_ENVIRONMENT.get_template('index.html')
    self.response.write(template.render(template_values))

app = webapp2.WSGIApplication([
  ('/.*', MainHandler),
], debug=True)