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266 lines
7.9 KiB
Twig
Executable File
266 lines
7.9 KiB
Twig
Executable File
layout: default.twig
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---
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<h2>Server API Reference</h2>
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<p>
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KalSMS communicates with the server via HTTP POST requests that expect an XML response.
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</p>
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<p>
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For convenience, KalSMS includes <a href='https://github.com/youngj/KalSMS/tree/master/server'>server libraries and example code</a>
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for certain languages to simplify handling its POST requests and generating response XML.
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</p>
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<p>
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If a server library is not yet available for your programming language, you can still use
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KalSMS by implementing code in accordance with the API reference below.
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We encourage you to contribute new libraries and example code back to the KalSMS project!
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</p>
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<h3>
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HTTP Request Format
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</h3>
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<p>
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The following parameters are sent by all POST requests from KalSMS:
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</p>
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<dl>
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<dt>"version" ::= <integer></dt>
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<dd>
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The API version of the POST requests (currently <code>"2"</code>).
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<br />
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<br />
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This number will be incremented whenever the format of POST requests changes significantly.
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This allows the server to support phones running different API versions at the same time.
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If a deployment has many phones running with KalSMS, the server should update its code first,
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then the phones can be upgraded to the new version of KalSMS as convenient.
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</dd>
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<dt>"phone_number" ::= <text></dt>
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<dd>
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The phone number of the phone running KalSMS, as entered under Menu > Settings.
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<br /><br />
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This allows the server to differentiate between KalSMS clients if multiple phones
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are running KalSMS.
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</dd>
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<dt>"action" ::= "outgoing" | "incoming" | "send_status"</dt>
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<dd>
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The request action determines the purpose of the HTTP request:
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<dl>
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<dt>"outgoing":</dt>
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<dd>
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Poll the server for outgoing messages
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</dd>
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<dt>"incoming":</dt>
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<dd>
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Forward an incoming SMS or MMS message to the server
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</dd>
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<dt>"send_status":</dt>
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<dd>
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Update the server on the status of sending an outgoing message
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</dd>
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</dl>
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The other POST parameters sent depend on the request action.
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</dd>
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</dl>
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The following HTTP Headers are sent in all POST requests from KalSMS:
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<dl>
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<dt>"X-Kalsms-Signature" ::= <text></dt>
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<dd>
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A signature of the request to verify the phone and the server share the same password
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(though it doesn't protect against MITM snooping or replay attacks).
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<br />
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<br />
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The signature is calculated by the following algorithm:
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<ol>
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<li>Sort all POST parameters (not including file uploads)
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in alphabetical order by the name of the field.</li>
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<li>Generate an input string by concatenating:
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<ul>
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<li>the server URL,</li>
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<li>each of the sorted POST parameters with their corresponding values, and</li>
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<li>the password,</li>
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</ul>
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with a comma in between each element, like so:
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<br /><br />
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<code>"<serverURL>,<name1>,<value1>,<...>,<nameN>,<valueN>,<password>"</code>
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</li>
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<li>Generate the SHA-1 hash of the input string in UTF-8</li>
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<li>Encode the SHA-1 hash using Base64 with no line breaks.</li>
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</ol>
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</dd>
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</dl>
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Additional parameters sent in POST requests with action=incoming:
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<dl>
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<dt>"from" ::= <text></dt>
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<dd>
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The phone number of the message sender.
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</dd>
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<dt>"message_type" ::= "sms" | "mms"</dt>
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<dd>
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Whether this message is an SMS or MMS.
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</dd>
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<dt>"message" ::= <text></dt>
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<dd>
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The message body of the SMS, or the content of the <code>text/plain</code> part of the MMS.
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</dd>
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</dl>
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Additional parameters sent in POST requests with action=incoming and message_type=mms:
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<dl>
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<dt>"mms_parts" ::= <json_array></dt>
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<dd>
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Metadata for each part of the MMS. Each item in the JSON array is an object
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with the following keys and values:
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<dl>
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<dt>"name" ::= <text></dt>
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<dd>
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The name of an additional form field where the content of the MMS part
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is sent as an attached file.
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</dd>
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<dt>"cid" ::= <text></dt>
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<dd>
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The Content ID of the MMS part. This allows the server to resolve
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references in the SMIL part of the MMS
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(e.g. <code><img region="Image" src="cid:805"/></code>).
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</dt>
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<dt>"type" ::= "application/smil" | "text/plain" | "image/jpeg" | ...</dt>
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<dd>
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The Content Type of the MMS part.
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</dd>
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<dt>"filename" ::= <text></dt>
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<dd>
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The filename of the MMS part, as sent by the sender phone,
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e.g. <code>"Image001.jpg"</code>.
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</dt>
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</dl>
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(Additional fields with the content of each MMS part. Text parts
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are encoded in UTF-8.)
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</dt>
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</dl>
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Additional parameters sent in POST requests with action=outgoing:
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<dl>
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<dt>
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(None)
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</dt>
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</dl>
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Additional parameters sent in POST requests with action=send_status:
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<dl>
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<dt>"id" ::= <text></dt>
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<dd>
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The Server's ID for the outgoing message (from the <code>id</code> attribute
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of an <a href='#sms'>sms</a> tag in a previous XML response from the server).
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</dd>
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<dt>"status" ::= "queued" | "failed" | "sent"</dt>
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<dd>
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The current status of the outgoing message.
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</dd>
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<dt>"error" ::= <text></dt>
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<dd>
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A description of the reason for the error, if the message
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failed to send; or, an empty string if the message
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has been sent successfully.
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</dd>
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</dl>
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<h3>
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HTTP Response Format
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</h4>
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<p>
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For a successul request, the server should return HTTP status code 200.
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If the signature check failed, the server should return status code 403.
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Other status codes may be used to signify errors.
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</p>
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HTTP response format for action=incoming and action=outgoing:
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<blockquote>
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The Content-Type header should be text/xml, with the content as follows:
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<dl>
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<dt><messages></dt>
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<dd>
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The root XML element.
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<br />
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<br />
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Attributes:
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<dl><dt>none</dt></dl>
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Content:
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<dl>
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<dt><sms>*</dt>
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<dd>The SMS messages to send.</dd>
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</dl>
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</dd>
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<dt id='sms'><sms></dt>
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<dd>
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Describes an outgoing SMS to send.
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<br /><br />
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Attributes:
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<dl>
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<dt>"id" ::= <text> (optional)</dt>
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<dd>
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An ID for this outgoing message. (KalSMS will send this
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back to the server as the id field in a send_status request.)
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</dd>
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<dt>"to" ::= <text> (optional for incoming, required for outgoing)</dt>
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<dd>
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The phone number to send the SMS to. If omitted for
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action=incoming, it will be sent as a reply to the original
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sender.
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</dd>
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</dl>
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Content:
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<dl>
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<dt>CDATA</dt>
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<dd>
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The content of the SMS message to send.
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</dd>
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</dd>
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</dl>
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Example:
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<pre>
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<?xml version='1.0' encoding='UTF-8'?>
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<messages>
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<sms id='42' to='5551212'>Message One</sms>
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<sms>Message Two</sms>
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</message>
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</pre>
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</blockquote>
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Response format for action=send_status:
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<blockquote>
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The response content is currently undefined and ignored.
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</blockquote>
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