main.py 文件源码

def grabChannelMetadata(self,channel):
        '''
        Takes a channel in the form of /user/username or /channel/hashvalue
        as a string. Downloads the webpage of the channel into the cache.
        Then reads the channels metadata into the channelCache for later
        use.
        '''
        # if the channel timer has expired or the channel does not
        # yet exist in the cache we need to update the channel data
        if self.checkTimer(channel+':meta','channelMetadataDelay') or\
        channel not in self.channelCache.names:
            # if channel is not in the cache then grab info from the website
            ##############
            # user channel information can be found by downloading the
            # user channel page with
            #"https://youtube.com"userName
            channelPage=self.cacheWebpage("https://www.youtube.com"+channel)
            # jerk out the banner image from the downloaded user webpage
            try:
                temp=channelPage.split('.hd-banner-image {background-image: url(//')
                temp=temp[1]
                temp=temp.split(');')
                # append https to the picture so it will work
                fanArt="https://"+temp[0]
            except:
                # if this does not work set the fanart to none
                fanArt='none'
            # split the page based on tag opening
            channelPage=channelPage.split("<")
            for tag in channelPage:
                # the channels metadata is stored in a image tag for the users
                # profile picture, so search for
                #'class="channel-header-profile-image"'
                if 'class="channel-header-profile-image"' in tag:
                    # inside this string you will have two important variables
                    # - first src="" will have the icon you should use for the channel
                    # - second title="" will have the human readable channel title
                    # you should store these things in the cache somehow to use them
                    # when rendering the channels view
                    # grab text in src attribute between parathenesis
                    icon=tag.split('src="')
                    icon=icon[1].split('"')
                    icon=icon[0]
                    # if a generated channel uses the other wierd icon format
                    if icon[:2]=='//':
                        icon='https:'+icon
                    # grab text in title attribute for channel title
                    title=tag.split('title="')
                    title=title[1].split('"')
                    title=title[0]
                    # clean html entities from title
                    title=self.cleanText(title)
                    # add channel information to the channel cache
                    tempChannelCache=dict()
                    # add title and icon
                    tempChannelCache['title']=title
                    tempChannelCache['icon']=icon
                    tempChannelCache['fanArt']=fanArt
                    self.channelCache.saveValue(channel,tempChannelCache)