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+        <a href="apiclient-module.html">Package&nbsp;apiclient</a> ::
+        Module&nbsp;channel
+      </span>
+    </td>
+    <td>
+      <table cellpadding="0" cellspacing="0">
+        <!-- hide/show private -->
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+      </table>
+    </td>
+  </tr>
+</table>
+<!-- ==================== MODULE DESCRIPTION ==================== -->
+<h1 class="epydoc">Module channel</h1><p class="nomargin-top"><span class="codelink"><a href="apiclient.channel-pysrc.html">source&nbsp;code</a></span></p>
+<pre class="literalblock">
+Channel notifications support.
+
+Classes and functions to support channel subscriptions and notifications
+on those channels.
+
+Notes:
+  - This code is based on experimental APIs and is subject to change.
+  - Notification does not do deduplication of notification ids, that's up to
+    the receiver.
+  - Storing the Channel between calls is up to the caller.
+
+
+Example setting up a channel:
+
+  # Create a new channel that gets notifications via webhook.
+  channel = new_webhook_channel(&quot;https://example.com/my_web_hook&quot;)
+
+  # Store the channel, keyed by 'channel.id'. Store it before calling the
+  # watch method because notifications may start arriving before the watch
+  # method returns.
+  ...
+
+  resp = service.objects().watchAll(
+    bucket=&quot;some_bucket_id&quot;, body=channel.body()).execute()
+  channel.update(resp)
+
+  # Store the channel, keyed by 'channel.id'. Store it after being updated
+  # since the resource_id value will now be correct, and that's needed to
+  # stop a subscription.
+  ...
+
+
+An example Webhook implementation using webapp2. Note that webapp2 puts
+headers in a case insensitive dictionary, as headers aren't guaranteed to
+always be upper case.
+
+  id = self.request.headers[X_GOOG_CHANNEL_ID]
+
+  # Retrieve the channel by id.
+  channel = ...
+
+  # Parse notification from the headers, including validating the id.
+  n = notification_from_headers(channel, self.request.headers)
+
+  # Do app specific stuff with the notification here.
+  if n.resource_state == 'sync':
+    # Code to handle sync state.
+  elif n.resource_state == 'exists':
+    # Code to handle the exists state.
+  elif n.resource_state == 'not_exists':
+    # Code to handle the not exists state.
+
+
+Example of unsubscribing.
+
+  service.channels().stop(channel.body())
+
+</pre>
+
+<!-- ==================== CLASSES ==================== -->
+<a name="section-Classes"></a>
+<table class="summary" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Classes</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-Classes"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a href="apiclient.channel.Notification-class.html" class="summary-name">Notification</a><br />
+      A Notification from a Channel.
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a href="apiclient.channel.Channel-class.html" class="summary-name">Channel</a><br />
+      A Channel for notifications.
+    </td>
+  </tr>
+</table>
+<!-- ==================== FUNCTIONS ==================== -->
+<a name="section-Functions"></a>
+<table class="summary" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Functions</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-Functions"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+<tr class="private">
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+      <table width="100%" cellpadding="0" cellspacing="0" border="0">
+        <tr>
+          <td><span class="summary-sig"><a name="_upper_header_keys"></a><span class="summary-sig-name">_upper_header_keys</span>(<span class="summary-sig-arg">headers</span>)</span></td>
+          <td align="right" valign="top">
+            <span class="codelink"><a href="apiclient.channel-pysrc.html#_upper_header_keys">source&nbsp;code</a></span>
+            
+          </td>
+        </tr>
+      </table>
+      
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+      <table width="100%" cellpadding="0" cellspacing="0" border="0">
+        <tr>
+          <td><span class="summary-sig"><a href="apiclient.channel-module.html#notification_from_headers" class="summary-sig-name">notification_from_headers</a>(<span class="summary-sig-arg">channel</span>,
+        <span class="summary-sig-arg">headers</span>)</span><br />
+      Parse a notification from the webhook request headers, validate
+  the notification, and return a Notification object.</td>
+          <td align="right" valign="top">
+            <span class="codelink"><a href="apiclient.channel-pysrc.html#notification_from_headers">source&nbsp;code</a></span>
+            
+          </td>
+        </tr>
+      </table>
+      
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+      <table width="100%" cellpadding="0" cellspacing="0" border="0">
+        <tr>
+          <td><span class="summary-sig"><a href="apiclient.channel-module.html#new_webhook_channel" class="summary-sig-name">new_webhook_channel</a>(<span class="summary-sig-arg">url</span>,
+        <span class="summary-sig-arg">token</span>=<span class="summary-sig-default">None</span>,
+        <span class="summary-sig-arg">expiration</span>=<span class="summary-sig-default">None</span>,
+        <span class="summary-sig-arg">params</span>=<span class="summary-sig-default">None</span>)</span><br />
+      Create a new webhook Channel.</td>
+          <td align="right" valign="top">
+            <span class="codelink"><a href="apiclient.channel-pysrc.html#new_webhook_channel">source&nbsp;code</a></span>
+            
+          </td>
+        </tr>
+      </table>
+      
+    </td>
+  </tr>
+</table>
+<!-- ==================== VARIABLES ==================== -->
+<a name="section-Variables"></a>
+<table class="summary" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Variables</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-Variables"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="EPOCH"></a><span class="summary-name">EPOCH</span> = <code title="datetime.datetime.utcfromtimestamp(0)">datetime.datetime.utcfromtimestamp(0)</code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a href="apiclient.channel-module.html#CHANNEL_PARAMS" class="summary-name">CHANNEL_PARAMS</a> = <code title="{'address': 'address', 'id': 'id', 'expiration': 'expiration', 'params\
+': 'params', 'resourceId': 'resource_id', 'resourceUri': 'resource_uri\
+', 'type': 'type', 'token': 'token',}">{'address': 'address', 'id': 'id', 'expiratio<code class="variable-ellipsis">...</code></code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="X_GOOG_CHANNEL_ID"></a><span class="summary-name">X_GOOG_CHANNEL_ID</span> = <code title="'X-GOOG-CHANNEL-ID'">'X-GOOG-CHANNEL-ID'</code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="X_GOOG_MESSAGE_NUMBER"></a><span class="summary-name">X_GOOG_MESSAGE_NUMBER</span> = <code title="'X-GOOG-MESSAGE-NUMBER'">'X-GOOG-MESSAGE-NUMBER'</code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="X_GOOG_RESOURCE_STATE"></a><span class="summary-name">X_GOOG_RESOURCE_STATE</span> = <code title="'X-GOOG-RESOURCE-STATE'">'X-GOOG-RESOURCE-STATE'</code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="X_GOOG_RESOURCE_URI"></a><span class="summary-name">X_GOOG_RESOURCE_URI</span> = <code title="'X-GOOG-RESOURCE-URI'">'X-GOOG-RESOURCE-URI'</code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="X_GOOG_RESOURCE_ID"></a><span class="summary-name">X_GOOG_RESOURCE_ID</span> = <code title="'X-GOOG-RESOURCE-ID'">'X-GOOG-RESOURCE-ID'</code>
+    </td>
+  </tr>
+</table>
+<!-- ==================== FUNCTION DETAILS ==================== -->
+<a name="section-FunctionDetails"></a>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Function Details</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-FunctionDetails"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+</table>
+<a name="notification_from_headers"></a>
+<div>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr><td>
+  <table width="100%" cellpadding="0" cellspacing="0" border="0">
+  <tr valign="top"><td>
+  <h3 class="epydoc"><span class="sig"><span class="sig-name">notification_from_headers</span>(<span class="sig-arg">channel</span>,
+        <span class="sig-arg">headers</span>)</span>
+  </h3>
+  </td><td align="right" valign="top"
+    ><span class="codelink"><a href="apiclient.channel-pysrc.html#notification_from_headers">source&nbsp;code</a></span>&nbsp;
+    </td>
+  </tr></table>
+  
+  <pre class="literalblock">
+Parse a notification from the webhook request headers, validate
+  the notification, and return a Notification object.
+
+Args:
+  channel: Channel, The channel that the notification is associated with.
+  headers: dict, A dictionary like object that contains the request headers
+    from the webhook HTTP request.
+
+Returns:
+  A Notification object.
+
+Raises:
+  errors.InvalidNotificationError if the notification is invalid.
+  ValueError if the X-GOOG-MESSAGE-NUMBER can't be converted to an int.
+
+</pre>
+  <dl class="fields">
+  </dl>
+</td></tr></table>
+</div>
+<a name="new_webhook_channel"></a>
+<div>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr><td>
+  <table width="100%" cellpadding="0" cellspacing="0" border="0">
+  <tr valign="top"><td>
+  <h3 class="epydoc"><span class="sig"><span class="sig-name">new_webhook_channel</span>(<span class="sig-arg">url</span>,
+        <span class="sig-arg">token</span>=<span class="sig-default">None</span>,
+        <span class="sig-arg">expiration</span>=<span class="sig-default">None</span>,
+        <span class="sig-arg">params</span>=<span class="sig-default">None</span>)</span>
+  </h3>
+  </td><td align="right" valign="top"
+    ><span class="codelink"><a href="apiclient.channel-pysrc.html#new_webhook_channel">source&nbsp;code</a></span>&nbsp;
+    </td>
+  </tr></table>
+  
+  <pre class="literalblock">
+Create a new webhook Channel.
+
+Args:
+  url: str, URL to post notifications to.
+  token: str, An arbitrary string associated with the channel that
+    is delivered to the target address with each notification delivered
+    over this channel.
+  expiration: datetime.datetime, A time in the future when the channel
+    should expire. Can also be None if the subscription should use the
+    default expiration. Note that different services may have different
+    limits on how long a subscription lasts. Check the response from the
+    watch() method to see the value the service has set for an expiration
+    time.
+  params: dict, Extra parameters to pass on channel creation. Currently
+    not used for webhook channels.
+
+</pre>
+  <dl class="fields">
+    <dt>Decorators:</dt>
+    <dd><ul class="nomargin-top">
+        <li><code>@util.positional(2)</code></li>
+    </ul></dd>
+  </dl>
+</td></tr></table>
+</div>
+<br />
+<!-- ==================== VARIABLES DETAILS ==================== -->
+<a name="section-VariablesDetails"></a>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Variables Details</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-VariablesDetails"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+</table>
+<a name="CHANNEL_PARAMS"></a>
+<div>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr><td>
+  <h3 class="epydoc">CHANNEL_PARAMS</h3>
+  
+  <dl class="fields">
+  </dl>
+  <dl class="fields">
+    <dt>Value:</dt>
+      <dd><table><tr><td><pre class="variable">
+{'address': 'address', 'id': 'id', 'expiration': 'expiration', 'params<span class="variable-linewrap"><img src="crarr.png" alt="\" /></span>
+': 'params', 'resourceId': 'resource_id', 'resourceUri': 'resource_uri<span class="variable-linewrap"><img src="crarr.png" alt="\" /></span>
+', 'type': 'type', 'token': 'token',}
+</pre></td></tr></table>
+</dd>
+  </dl>
+</td></tr></table>
+</div>
+<br />
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