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94 lines
3.9 KiB
94 lines
3.9 KiB
<div class="narrow">
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<?= partial('partials/header') ?>
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<?php ob_start() ?>
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## Creating a Micropub Endpoint
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After a client has obtained an access token and discovered the user's Micropub endpoint
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it is ready to make requests to create posts.
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### The Request
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This is not intended to be a comprehensive guide to Micropub, and only includes the
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fields that this client sends.
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The request to create a post will be sent with as a standard HTTP form-encoded request
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The example code here is written in PHP but the idea is applicable in any language.
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The request will contain the following POST parameters:
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* `h=entry` - Indicates the type of object being created, in this case an <a href="http://indiewebcamp.com/h-entry">h-entry</a>.
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* `content` - The text content the user entered, in this case the caption on the Instagram photo.
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* `category` - A comma-separated list of tags that you entered
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* `location` - A "geo" URI including the latitude and longitude of the photo if included. (Will look like `geo:37.786971,-122.399677;u=50`, where u=50 indicates the "uncertainty" of the location in meters)
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* `in-reply-to` - If set, this is a URL that the post is in reply to
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The request will also contain an access token in the HTTP `Authorization` header:
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<pre>
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Authorization: Bearer XXXXXXXX
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</pre>
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### Verifying Access Tokens
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Before you can begin processing the photo, you must first verify the access token is valid
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and contains at least the "post" scope.
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How exactly you do this is dependent on your architecture. You can query the token endpoint
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to check if an access token is still valid. See [https://tokens.indieauth.com/#verify tokens.indieauth.com]
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for more information.
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Once you have looked up the token info, you need to make a determination
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about whether that access token is still valid. You'll have the following information
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at hand that can be used to check:
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* `me` - The user who this access token corresponds to.
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* `client_id` - The app that generated the token.
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* `scope` - The list of scopes that were authorized by the user.
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* `issued_at` - The date the token was issued.
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Keep in mind that it may be possible for another user besides yourself to have created
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an access token at your token endpoint, so the first thing you'll do when verifying
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is making sure the "me" parameter matches your own domain. This way you are the only
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one that can create posts on your website.
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### Validating the Request Parameters
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A valid request to create a post will contain the parameters listed above. For now,
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you can verify the presence of everything in the list, or you can try to genericize your
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micropub endpoint so that it can also create [http://ownyourgram.com/creating-a-micropub-endpoint photo posts].
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At a bare minimum, a Micropub request will contain the following:
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* `h=entry`
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* `content`
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The access token must also contain at least the "post" scope.
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### The Response
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Once you've validated the access token and checked for the presence of all required parameters,
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you can create a post in your website with the information provided.
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If a post was successfully created, the endpoint must return an `HTTP 201` response with a
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`Location` header that points to the URL of the post. No body is required for the response.
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<pre>
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HTTP/1.1 201 Created
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Location: http://example.com/post/100
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</pre>
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If there was an error, the response should include an HTTP error code as appropriate,
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and optionally an HTML or other body with more information. Below is a list of possible errors.
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* `HTTP 401 Unauthorized` - No access token was provided in the request.
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* `HTTP 403 Forbidden` - An access token was provided, but the authenticated user does not have permission to complete the request.
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* `HTTP 400 Bad Request` - Something was wrong with the request, such as a missing "h" parameter, or other missing data. The response body may contain more human-readable information about the error.
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<?= Markdown(ob_get_clean()) ?>
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</div>
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