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67 lines
2.8 KiB
67 lines
2.8 KiB
API Handling
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============
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In general, the OpenProject Frontend uses _all_ of the existing working APIs to provide its functionality, as the current working version for `APIv3` is not feature complete.
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The documentation for these APIs and their capabilities:
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- [APIv3](http://opf.github.io/apiv3-doc/)
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- APIv2 docs are located in the `opf/openproject` repository at `./doc/apiv2-documentation.md`
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To get a feeling for which API is used at which point, please refer to the `PathHelper` located at `./frontend/app/helpers/path-helper.js`. It is used throughout the application to centralize knowledge about paths.
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## HAL
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While having a `PathHelper` certainly helps, the long-term idea is to leverage the [HAL](http://stateless.co/hal_specification.html)-capabilities of the APIv3 (thereby leaving `v2` behind) to let any client discover the paths available for a resource by inspecting the responses from any given call.
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__Note:__ All responses from the APIv3 are thereby of `Content-Type: application/hal+json` and not just `Content-Type: application/json`. Some developer client tools sometimes get confused with that and will not interpret the formatting correctly.
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Example:
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```json
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// calling a project
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{
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"_type": "Project",
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"_links": {
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"self": {
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"href": "/api/v3/projects/1",
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"title": "Lorem"
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},
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"createWorkPackage": {
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"href": "/api/v3/projects/1/work_packages/form",
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"method": "post"
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},
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"createWorkPackageImmediate": {
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"href": "/api/v3/projects/1/work_packages",
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"method": "post"
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},
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"categories": { "href": "/api/v3/projects/1/categories" },
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"types": { "href": "/api/v3/projects/1/types" },
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"versions": { "href": "/api/v3/projects/1/versions" }
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},
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"id": 1,
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"identifier": "project_identifier",
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"name": "Project example",
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"description": "Lorem ipsum dolor sit amet"
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}
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```
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The `Project` structure contains links to ressources associated. Given the knowledge about `_links`, one may easily infer the path from the response:
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```javascript
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// some magic to retrieve an object, note that the services used are examplary
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// and can not be found in the actual codebase
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ProjectsService.getProject('project_identifier').then(function(project) {
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var pathToVersions = project._links.versions.href;
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// the VersionsService has knowledge about pathToVersions in its
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// forProject method
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VersionsService.forProject(project).then(function(versions) {
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// versions should be the result of the call to pathtoVersions
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console.log(versions);
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});
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});
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```
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This is in principle a very good concept to delegate responsibility of inference to the client and absolves the client of having to know each path in the application in advance.
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