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AWS Lambda: mime types and extensions; remove CORS config from code

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This commit is contained in:
Brandon Liu
2022-11-14 14:39:58 +08:00
parent 79cb3ba96f
commit 6d866e3507
2 changed files with 36 additions and 9 deletions
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1
serverless/aws/README.md
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@@ -24,7 +24,6 @@ Configure these Lambda environment variables:
* `PMTILES_PATH`: optional, define how a tileset name is translated into an S3 key. Default `{name}.pmtiles`
* Example path setting for objects in a directory: `my_folder/{name}/file.pmtiles`
* `TILE_PATH`: optional, define the URL route of the tiles API. Default `/{name}/{z}/{x}/{y}.pbf`
* `CORS`: optional, the exact value of the `Access-Control-Allow-Origin` header in the Lambda response. Note that this header will be cached by CloudFront; if you need dynamic multiple-origin support with CloudFront you should use [CloudFront Functions](https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/cloudfront-functions.html) instead.
For API Gateway integration, your Lambda Proxy Integration route will need to specify a greedy capturing parameter called `proxy` e.g. `/{proxy+}` (the default). API Gateway responses will always be GZIP-encoded.

44
serverless/aws/src/index.ts
View File

@@ -10,6 +10,7 @@ import {
RangeResponse,
Source,
Compression,
TileType,
} from "../../../js";
// @ts-ignore
@@ -69,7 +70,6 @@ export const tile_path = (
return { ok: false, name: "", tile: [0, 0, 0], ext: "" };
};
class S3Source implements Source {
archive_name: string;
@@ -143,19 +143,47 @@ export const handler = async (
}
var headers: Headers = {};
if (process.env.CORS) {
headers["Access-Control-Allow-Origin"] = process.env.CORS;
}
// TODO: extension enforcement and MIME types, metadata and TileJSON
// TODO: metadata and TileJSON
const source = new S3Source(name);
const p = new PMTiles(source, CACHE);
try {
const header = await p.getHeader();
// TODO optimize by checking min/max zoom, return 404
if (tile[0] < header.minZoom || tile[0] > header.maxZoom) {
return apiResp(404, "");
}
// part of the list of Cloudfront compressible types.
headers["Content-Type"] = "application/vnd.mapbox-vector-tile";
for (const pair of [
[TileType.Mvt, "mvt"],
[TileType.Png, "png"],
[TileType.Jpeg, "jpg"],
[TileType.Webp, "webp"],
]) {
if (header.tileType === pair[0] && ext !== pair[1]) {
return apiResp(
400,
"Bad request: archive has type ." + pair[1],
false,
headers
);
}
}
switch (header.tileType) {
case TileType.Mvt:
// part of the list of Cloudfront compressible types.
headers["Content-Type"] = "application/vnd.mapbox-vector-tile";
break;
case TileType.Png:
headers["Content-Type"] = "image/png";
break;
case TileType.Jpeg:
headers["Content-Type"] = "image/jpeg";
break;
case TileType.Webp:
headers["Content-Type"] = "image/webp";
break;
}
const tile_result = await p.getZxy(tile[0], tile[1], tile[2]);
if (tile_result) {