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New Endpoint - manifest.json #462

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merged 4 commits into from
Jan 23, 2023
Merged

New Endpoint - manifest.json #462

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Files Manifest
mplsmitch Oct 30, 2022
c87700e
SHOULD to MUST
mplsmitch Oct 30, 2022
a19042a
fix typos, add missing description text
mplsmitch Jan 17, 2023
9546710
Merge branch 'master' into new-disc-10282022
josee-sabourin Jan 23, 2023
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57 changes: 55 additions & 2 deletions gbfs.md
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Expand Up @@ -23,6 +23,7 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "S
* [Field Types](#field-types)
* [Files](#files)
* [gbfs.json](#gbfsjson)
* [manifest.json](#manifestjson)
* [gbfs_versions.json](#gbfs_versionsjson)
* [system_information.json](#system_informationjson)
* [vehicle_types.json](#vehicle_typesjson) *(added in v2.1)*
Expand Down Expand Up @@ -61,7 +62,8 @@ This section defines terms that are used throughout this document.

File Name | REQUIRED | Defines
---|---|---
gbfs.json | Yes <br/>*(as of v2.0)* | Auto-discovery file that links to all of the other files published by the system.
gbfs.json | Yes <br/>*(as of v2.0)* | Auto-discovery file that links to the other files published for the system. To avoid circular references this file MUST NOT contain links to `manifest.json`.
manifest.json | Conditionally REQUIRED | Required of any GBFS dataset provider that publishes more than one GBFS dataset. For example, if you publish one set of files for Berlin and a different set for Paris, this file is REQUIRED. A discovery file containing a comprehensive list of `gbfs.json` URLs for all GBFS datasets published by the provider.
gbfs_versions.json | OPTIONAL | Lists all feed endpoints published according to versions of the GBFS documentation.
system_information.json | Yes | Details including system operator, system location, year implemented, URL, contact info, time zone.
vehicle_types.json <br/>*(added in v2.1)* | Conditionally REQUIRED | Describes the types of vehicles that System operator has available for rent. REQUIRED of systems that include information about vehicle types in the `vehicle_status` file. If this file is not included, then all vehicles in the feed are assumed to be non-motorized bicycles.
Expand Down Expand Up @@ -259,7 +261,7 @@ Field Name | REQUIRED | Type | Defines

### gbfs.json

The `gbfs.json` discovery file SHOULD represent a single system or geographic area in which vehicles are operated. The location (URL) of the `gbfs.json` file SHOULD be made available to the public using the specification’s [auto-discovery](#auto-discovery) function.<br />The following fields are all attributes within the main `data` object for this feed.
The `gbfs.json` discovery file SHOULD represent a single system or geographic area in which vehicles are operated. The location (URL) of the `gbfs.json` file SHOULD be made available to the public using the specification’s [auto-discovery](#auto-discovery) function. To avoild circular references, this file MUST NOT contain links to `manifest.json` files.<br />The following fields are all attributes within the main `data` object for this feed.
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Mostly just curious: you call out avoid linking to manifest.json to avoid circular dependencies, but system_information.json contains a link to the manifest url, providing a circular link of sorts (gbfs.json -> system_information.json -> manifest.json). Is the idea here that consumers are automatically downloading all files referenced in gbfs.json without regard to type and you are worried about them getting stuck in a download loop? Does a similar loop exist for gbfs_versions.json and has it been a problem?

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Is the idea here that consumers are automatically downloading all files referenced in gbfs.json without regard to type and you are worried about them getting stuck in a download loop?

Yes - that's exactly the concern. It's true that looping is also possible via system_information.json but the manifest.json link needs to go someplace and that's the logical location for it. We haven't heard of any one having problems with gbfs_versions.json . This issue was specifically called out when I started work on this endpoint.


Field Name | REQUIRED | Type | Defines
---|---|---|---
Expand Down Expand Up @@ -303,7 +305,57 @@ Field Name | REQUIRED | Type | Defines
}
}
```
### manifest.json
An index of `gbfs.json` URLs for each GBFS data set produced by a publisher. A single instance of this file should be published at a single stable URL, for example: `https://example.com/gbfs/manifest.json`

The following fields are all attributes within the main `data` object for this feed.

Field Name | REQUIRED | Type | Defines
---|---|---|---
`datasets` | Yes | Array | An array of objects, each containing the keys below.
\-&nbsp;`system_id` | Yes | ID | The `system_id` from `system_information.json` for the corresponding data set(s) |
\-&nbsp;`versions` | Yes | Array | Contains one object, as defined below, for each of the available versions of a feed. The array MUST be sorted by increasing MAJOR and MINOR version number.
&emsp;&emsp;\-`version` | Yes | String | The semantic version of the feed in the form `X.Y`.
&emsp;&emsp;\-`url` | Yes | URL | URL of the corresponding `gbfs.json` endpoint.

**Example:**
```json
{
"last_updated":1667004473,
"ttl":0,
"version":"3.0",
"data":{
"datasets":[
{
"system_id":"example_berlin",
"versions":[
{
"version":"2.0",
"url":"https://berlin.example.com/gbfs/2/gbfs"
},
{
"version":"3.0",
"url":"https://berlin.example.com/gbfs/3/gbfs"
}
]
},
{
"system_id":"example_paris",
"versions":[
{
"version":"2.0",
"url":"https://paris.example.com/gbfs/2/gbfs"
},
{
"version":"3.0",
"url":"https://paris.example.com/gbfs/3/gbfs"
}
]
}
]
}
}
```
### gbfs_versions.json

Each expression of a GBFS feed describes all of the versions that are available.
Expand Down Expand Up @@ -356,6 +408,7 @@ Field Name | REQUIRED | Type | Defines
`phone_number` <br/>*(as of v3.0-RC)* | OPTIONAL | Phone Number | This OPTIONAL field SHOULD contain a single voice telephone number for the specified system’s customer service department. MUST be in [E.164](https://www.itu.int/rec/T-REC-E.164-201011-I/en) format as defined in [Field Types](#field-types).
`email` | OPTIONAL | Email | This OPTIONAL field SHOULD contain a single contact email address actively monitored by the operator’s customer service department. This email address SHOULD be a direct contact point where riders can reach a customer service representative.
`feed_contact_email` | OPTIONAL | Email | This OPTIONAL field SHOULD contain a single contact email for feed consumers to report technical issues with the feed.
`manifest_url` | Conditionally REQUIRED | URL | REQUIRED if the producer publishes datasets for more than one system geography, for example Berlin and Paris. A fully qualified URL pointing to the [manifest.json](#manifestjson) file for the publisher.
`timezone` | Yes | Timezone | The time zone where the system is located.
`license_id` <br/>*(added in v3.0-RC)* | Conditionally REQUIRED | String | REQUIRED if the dataset is provided under a standard license. An identifier for a standard license from the [SPDX License List](https://spdx.org/licenses/). Provide `license_id` rather than `license_url` if the license is included in the SPDX License List. See the GBFS wiki for a [comparison of a subset of standard licenses](data-licenses.md). If the `license_id` and `license_url` fields are blank or omitted, this indicates that the feed is provided under the [Creative Commons Universal Public Domain Dedication](https://creativecommons.org/publicdomain/zero/1.0/legalcode).
`license_url` | Conditionally REQUIRED <br/>*(as of v3.0-RC)* | URL | REQUIRED if the dataset is provided under a customized license. A fully qualified URL of a page that defines the license terms for the GBFS data for this system. Do not specify a `license_url` if `license_id` is specified. If the `license_id` and `license_url` fields are blank or omitted, this indicates that the feed is provided under the [Creative Commons Universal Public Domain Dedication](https://creativecommons.org/publicdomain/zero/1.0/legalcode). *(as of v3.0-RC)*
Expand Down