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Add referrerPolicy to TileLayer #7945

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merged 3 commits into from
Jan 27, 2022
Merged

Add referrerPolicy to TileLayer #7945

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5f3ccce
add referrerPolicy to TileLayer, fixes #7943
natevw Jan 26, 2022
ed83781
fix typo in docstring
natevw Jan 26, 2022
15e60cf
drop the "true" option handling for the new referrerPolicy TileLayer …
natevw Jan 27, 2022
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16 changes: 15 additions & 1 deletion src/layer/tile/TileLayer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,15 @@ export var TileLayer = GridLayer.extend({
// Whether the crossOrigin attribute will be added to the tiles.
// If a String is provided, all tiles will have their crossOrigin attribute set to the String provided. This is needed if you want to access tile pixel data.
// Refer to [CORS Settings](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes) for valid String values.
crossOrigin: false
crossOrigin: false,

// @option referrerPolicy: Boolean|String = false
// Whether the referrerPolicy attribute will be added to the tiles.
// If a String is provided, all tiles will have their referrerPolicy attribute set to the String provided.
// This may be needed if your map's rendering context has a strict default but your tile provider expects a valid referrer
// (e.g. to validate an API token).
// Refer to [HTMLImageElement.referrerPolicy](https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/referrerPolicy) for valid String values.
referrerPolicy: false
},

initialize: function (url, options) {
Expand Down Expand Up @@ -140,6 +148,12 @@ export var TileLayer = GridLayer.extend({
tile.crossOrigin = this.options.crossOrigin === true ? '' : this.options.crossOrigin;
}

// for this new option we follow the documented behavior
// more closely by only setting the property when string
if (typeof this.options.referrerPolicy === 'string') {
tile.referrerPolicy = this.options.referrerPolicy;
}

/*
Alt tag is set to empty string to keep screen readers from reading URL and for compliance reasons
https://www.w3.org/TR/WCAG20-TECHS/H67
Expand Down