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xhr.status < 300 && xhr.response) {\n callback(null, {\n data: response,\n cacheControl: xhr.getResponseHeader('Cache-Control'),\n expires: xhr.getResponseHeader('Expires'),\n });\n } else {\n callback(\n new AJAXError(xhr.statusText, xhr.status, requestParameters.url),\n );\n }\n };\n xhr.send();\n return xhr;\n};\n\nfunction sameOrigin(url: string) {\n const a = window.document.createElement('a');\n a.href = url;\n return (\n a.protocol === window.document.location.protocol &&\n a.host === window.document.location.host\n );\n}\n\nconst transparentPngUrl =\n 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVQYV2NgAAIAAAUAAarVyFEAAAAASUVORK5CYII=';\n\nexport const getImage = (requestParameters: any, callback: any) => {\n // request the image with XHR to work around caching issues\n // see https://github.com/mapbox/mapbox-gl-js/issues/1470\n return getArrayBuffer(requestParameters, (err: string, imgData: any) => {\n if (err) {\n callback(err);\n } else if (imgData) {\n const img = new window.Image();\n img.crossOrigin = 'anonymous';\n const URL = window.URL || window.webkitURL;\n img.onload = () => {\n callback(null, img);\n URL.revokeObjectURL(img.src);\n };\n const blob = new window.Blob([new Uint8Array(imgData.data)], {\n type: 'image/png',\n });\n img.src = imgData.data.byteLength\n ? URL.createObjectURL(blob)\n : transparentPngUrl;\n }\n });\n};\n"],"file":"fetchData.js"} |