AWSTemplateFormatVersion: 2010-09-09
Description: Serve Z/X/Y tiles through CloudFront + Lambda from an existing S3 bucket.
Parameters:
  BucketName:
    Description: >-
      Name of an existing S3 bucket with .pmtiles tilesets. Should be in the
      same region as your CloudFormation stack. Can be a RequesterPays bucket in
      another account.
    Type: String
    MinLength: 1
  DefaultTTL:
    Description: Default time-to-live for cached tiles in the CloudFront distribution.
    Type: Number
    Default: 86400
  AllowedOrigins:
    Description: >-
      Comma-separated list of domains (e.g. example.com) allowed by browser CORS
      policy, or * for all origins.
    Type: List<String>
    Default: '*'
  PublicHostname:
    Description: >-
      Optional. Replace *.cloudfront.net in TileJSON with a custom hostname
      (e.g. example.com). See docs on how this value is cached.
    Type: String
Outputs:
  CloudFrontDistributionUrl:
    Description: URL of the CloudFront distribution for cached tiles.
    Value: !Sub https://${CloudFrontDistribution.DomainName}
    Export:
      Name: !Sub ${AWS::StackName}-CloudFrontDistributionURL
Conditions:
  IsPublicHostnameProvided: !Not 
    - !Equals 
      - !Ref PublicHostname
      - ''
Resources:
  LogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/lambda/${AWS::StackName}
      RetentionInDays: 7
  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: !Sub ${AWS::StackName}-LambdaLoggingPolicy
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource: !Sub >-
                  arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}:log-stream:*
        - PolicyName: !Sub ${AWS::StackName}-LambdaS3AccessPolicy
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action: s3:GetObject
                Resource: !Sub arn:aws:s3:::${BucketName}/*
  LambdaFunctionUrl:
    Type: AWS::Lambda::Url
    Properties:
      AuthType: NONE
      TargetFunctionArn: !GetAtt LambdaFunction.Arn
      InvokeMode: BUFFERED
  LambdaFunctionUrlPermissionInvokeUrl:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunctionUrl
      FunctionName: !Ref LambdaFunction
      Principal: '*'
      FunctionUrlAuthType: NONE
  LambdaFunctionUrlPermissionInvokeFunction:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !Ref LambdaFunction
      Principal: '*'
  ViewerRequestCloudFrontFunction:
    Type: AWS::CloudFront::Function
    Properties:
      Name: !Sub ${AWS::StackName}-ViewerRequestCloudFrontFunction
      AutoPublish: true
      FunctionCode: |
        function handler(event) {
          const request = event.request;
          request.headers['x-distribution-domain-name'] = { value: event.context.distributionDomainName };
          return request;
        }
      FunctionConfig:
        Comment: Add x-distribution-domain header.
        Runtime: cloudfront-js-2.0
  CloudFrontDistribution:
    Type: AWS::CloudFront::Distribution
    DeletionPolicy: Delete
    Properties:
      DistributionConfig:
        Origins:
          - Id: LambdaOrigin
            DomainName: !Select 
              - 2
              - !Split 
                - /
                - !GetAtt LambdaFunctionUrl.FunctionUrl
            CustomOriginConfig:
              OriginProtocolPolicy: https-only
        DefaultCacheBehavior:
          TargetOriginId: LambdaOrigin
          ViewerProtocolPolicy: redirect-to-https
          CachePolicyId: !Ref CachePolicyId
          ResponseHeadersPolicyId: !Ref ResponseHeadersPolicyId
          OriginRequestPolicyId: b689b0a8-53d0-40ab-baf2-68738e2966ac
          FunctionAssociations: !If 
            - IsPublicHostnameProvided
            - !Ref AWS::NoValue
            - - EventType: viewer-request
                FunctionARN: !GetAtt ViewerRequestCloudFrontFunction.FunctionARN
        Enabled: true
        HttpVersion: http2and3
        Comment: CloudFront Distribution
        PriceClass: PriceClass_All
  CachePolicyId:
    Type: AWS::CloudFront::CachePolicy
    Properties:
      CachePolicyConfig:
        Name: !Sub ${AWS::StackName}-CachePolicyConfig
        DefaultTTL: !Ref DefaultTTL
        MaxTTL: 31536000
        MinTTL: 0
        ParametersInCacheKeyAndForwardedToOrigin:
          EnableAcceptEncodingBrotli: true
          EnableAcceptEncodingGzip: true
          HeadersConfig:
            HeaderBehavior: none
          CookiesConfig:
            CookieBehavior: none
          QueryStringsConfig:
            QueryStringBehavior: none
  ResponseHeadersPolicyId:
    Type: AWS::CloudFront::ResponseHeadersPolicy
    Properties:
      ResponseHeadersPolicyConfig:
        Name: !Sub ${AWS::StackName}-ResponseHeadersPolicyConfig
        CorsConfig:
          AccessControlAllowOrigins:
            Items: !Ref AllowedOrigins
          AccessControlAllowHeaders:
            Items:
              - '*'
          AccessControlAllowMethods:
            Items:
              - GET
              - HEAD
              - OPTIONS
          AccessControlExposeHeaders:
            Items:
              - ETag
          AccessControlAllowCredentials: false
          OriginOverride: true
        Comment: CORS policy for Protomaps
  LambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: !Sub ${AWS::StackName}-LambdaFunction
      Runtime: nodejs22.x
      Architectures:
        - arm64
      Role: !GetAtt LambdaExecutionRole.Arn
      Handler: index.handler
      MemorySize: 512
      LoggingConfig:
        LogGroup: !Ref LogGroup
      Environment:
        Variables:
          BUCKET: !Ref BucketName
          PUBLIC_HOSTNAME: !Ref PublicHostname
      Code:
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          y=+c.substr(8);h=yield
          fetch(this.url,{signal:s,cache:"reload",headers:{range:`bytes=0-${y-1}`}})}let
          f=h.headers.get("Etag");if(f!=null&&f.startsWith("W/")&&(f=null),h.status===416||i&&f&&f!==i)throw
          this.mustReload=!0,new Q(`Server returned non-matching ETag ${i} after
          one retry. Check browser extensions and servers for issues that may
          affect correct ETag headers.`);if(h.status>=300)throw new Error(`Bad
          response code: ${h.status}`);let
          u=h.headers.get("Content-Length");if(h.status===200&&(!u||+u>r))throw
          o&&o.abort(),new Error("Server returned no content-length header or
          content-length exceeding request. Check that your storage backend
          supports HTTP Byte Serving.");return{data:yield
          h.arrayBuffer(),etag:f||void
          0,cacheControl:h.headers.get("Cache-Control")||void
          0,expires:h.headers.get("Expires")||void
          0}})}};d(rt,"FetchSource");var Gr=rt;function O(t,e){let
          r=t.getUint32(e+4,!0),n=t.getUint32(e+0,!0);return
          r*J(2,32)+n}d(O,"getUint64");function nt(t,e){let r=new
          DataView(t),n=r.getUint8(7);if(n>3)throw new Error(`Archive is spec
          version ${n} but this library supports up to spec version
          3`);return{specVersion:n,rootDirectoryOffset:O(r,8),rootDirectoryLength:O(r,16),jsonMetadataOffset:O(r,24),jsonMetadataLength:O(r,32),leafDirectoryOffset:O(r,40),leafDirectoryLength:O(r,48),tileDataOffset:O(r,56),tileDataLength:O(r,64),numAddressedTiles:O(r,72),numTileEntries:O(r,80),numTileContents:O(r,88),clustered:r.getUint8(96)===1,internalCompression:r.getUint8(97),tileCompression:r.getUint8(98),tileType:r.getUint8(99),minZoom:r.getUint8(100),maxZoom:r.getUint8(101),minLon:r.getInt32(102,!0)/1e7,minLat:r.getInt32(106,!0)/1e7,maxLon:r.getInt32(110,!0)/1e7,maxLat:r.getInt32(114,!0)/1e7,centerZoom:r.getUint8(118),centerLon:r.getInt32(119,!0)/1e7,centerLat:r.getInt32(123,!0)/1e7,etag:e}}d(nt,"bytesToHeader");function
          we(t){let e={buf:new Uint8Array(t),pos:0},r=Z(e),n=[],i=0;for(let
          o=0;o<r;o++){let
          s=Z(e);n.push({tileId:i+s,offset:0,length:0,runLength:1}),i+=s}for(let
          o=0;o<r;o++)n[o].runLength=Z(e);for(let
          o=0;o<r;o++)n[o].length=Z(e);for(let o=0;o<r;o++){let
          s=Z(e);s===0&&o>0?n[o].offset=n[o-1].offset+n[o-1].length:n[o].offset=s-1}return
          n}d(we,"deserializeIndex");var it=class extends
          Error{};d(it,"EtagMismatch");var Q=it;function xe(t,e){return
          b(this,null,function*(){let r=yield t.getBytes(0,16384);if(new
          DataView(r.data).getUint16(0,!0)!==19792)throw new Error("Wrong magic
          number for PMTiles archive");let
          n=r.data.slice(0,qr),i=nt(n,r.etag),o=r.data.slice(i.rootDirectoryOffset,i.rootDirectoryOffset+i.rootDirectoryLength),s=`${t.getKey()}|${i.etag||""}|${i.rootDirectoryOffset}|${i.rootDirectoryLength}`,a=we(yield
          e(o,i.internalCompression));return[i,[s,a.length,a]]})}d(xe,"getHeaderAndRoot");function
          Ce(t,e,r,n,i){return b(this,null,function*(){let o=yield
          t.getBytes(r,n,void 0,i.etag),s=yield
          e(o.data,i.internalCompression),a=we(s);if(a.length===0)throw new
          Error("Empty directory is invalid");return
          a})}d(Ce,"getDirectory");var
          ot=class{constructor(e=100,r=!0,n=ie){this.cache=new
          Map,this.maxCacheEntries=e,this.counter=1,this.decompress=n}getHeader(e){return
          b(this,null,function*(){let
          r=e.getKey(),n=this.cache.get(r);if(n)return
          n.lastUsed=this.counter++,n.data;let i=yield
          xe(e,this.decompress);return
          i[1]&&this.cache.set(i[1][0],{lastUsed:this.counter++,data:i[1][2]}),this.cache.set(r,{lastUsed:this.counter++,data:i[0]}),this.prune(),i[0]})}getDirectory(e,r,n,i){return
          b(this,null,function*(){let
          o=`${e.getKey()}|${i.etag||""}|${r}|${n}`,s=this.cache.get(o);if(s)return
          s.lastUsed=this.counter++,s.data;let a=yield
          Ce(e,this.decompress,r,n,i);return
          this.cache.set(o,{lastUsed:this.counter++,data:a}),this.prune(),a})}prune(){if(this.cache.size>this.maxCacheEntries){let
          e=1/0,r;this.cache.forEach((n,i)=>{n.lastUsed<e&&(e=n.lastUsed,r=i)}),r&&this.cache.delete(r)}}invalidate(e){return
          b(this,null,function*(){this.cache.delete(e.getKey())})}};d(ot,"ResolvedValueCache");var
          st=ot,at=class{constructor(e=100,r=!0,n=ie){this.cache=new
          Map,this.invalidations=new
          Map,this.maxCacheEntries=e,this.counter=1,this.decompress=n}getHeader(e){return
          b(this,null,function*(){let
          r=e.getKey(),n=this.cache.get(r);if(n)return
          n.lastUsed=this.counter++,yield n.data;let i=new
          Promise((o,s)=>{xe(e,this.decompress).then(a=>{a[1]&&this.cache.set(a[1][0],{lastUsed:this.counter++,data:Promise.resolve(a[1][2])}),o(a[0]),this.prune()}).catch(a=>{s(a)})});return
          this.cache.set(r,{lastUsed:this.counter++,data:i}),i})}getDirectory(e,r,n,i){return
          b(this,null,function*(){let
          o=`${e.getKey()}|${i.etag||""}|${r}|${n}`,s=this.cache.get(o);if(s)return
          s.lastUsed=this.counter++,yield s.data;let a=new
          Promise((l,h)=>{Ce(e,this.decompress,r,n,i).then(f=>{l(f),this.prune()}).catch(f=>{h(f)})});return
          this.cache.set(o,{lastUsed:this.counter++,data:a}),a})}prune(){if(this.cache.size>=this.maxCacheEntries){let
          e=1/0,r;this.cache.forEach((n,i)=>{n.lastUsed<e&&(e=n.lastUsed,r=i)}),r&&this.cache.delete(r)}}invalidate(e){return
          b(this,null,function*(){let
          r=e.getKey();if(this.invalidations.get(r))return yield
          this.invalidations.get(r);this.cache.delete(e.getKey());let n=new
          Promise((i,o)=>{this.getHeader(e).then(s=>{i(),this.invalidations.delete(r)}).catch(s=>{o(s)})});this.invalidations.set(r,n)})}};d(at,"SharedPromiseCache");var
          Kr=at,lt=class{constructor(e,r,n){typeof e=="string"?this.source=new
          Gr(e):this.source=e,n?this.decompress=n:this.decompress=ie,r?this.cache=r:this.cache=new
          Kr}getHeader(){return b(this,null,function*(){return yield
          this.cache.getHeader(this.source)})}getZxyAttempt(e,r,n,i){return
          b(this,null,function*(){let o=et(e,r,n),s=yield
          this.cache.getHeader(this.source);if(e<s.minZoom||e>s.maxZoom)return;let
          a=s.rootDirectoryOffset,l=s.rootDirectoryLength;for(let
          h=0;h<=3;h++){let f=yield
          this.cache.getDirectory(this.source,a,l,s),u=tt(f,o);if(u){if(u.runLength>0){let
          c=yield
          this.source.getBytes(s.tileDataOffset+u.offset,u.length,i,s.etag);return{data:yield
          this.decompress(c.data,s.tileCompression),cacheControl:c.cacheControl,expires:c.expires}}a=s.leafDirectoryOffset+u.offset,l=u.length}else
          return}throw new Error("Maximum directory depth
          exceeded")})}getZxy(e,r,n,i){return b(this,null,function*(){try{return
          yield this.getZxyAttempt(e,r,n,i)}catch(o){if(o instanceof Q)return
          this.cache.invalidate(this.source),yield
          this.getZxyAttempt(e,r,n,i);throw o}})}getMetadataAttempt(){return
          b(this,null,function*(){let e=yield
          this.cache.getHeader(this.source),r=yield
          this.source.getBytes(e.jsonMetadataOffset,e.jsonMetadataLength,void
          0,e.etag),n=yield this.decompress(r.data,e.internalCompression),i=new
          TextDecoder("utf-8");return
          JSON.parse(i.decode(n))})}getMetadata(){return
          b(this,null,function*(){try{return yield
          this.getMetadataAttempt()}catch(e){if(e instanceof Q)return
          this.cache.invalidate(this.source),yield
          this.getMetadataAttempt();throw e}})}getTileJson(e){return
          b(this,null,function*(){let r=yield this.getHeader(),n=yield
          this.getMetadata(),i=X(r.tileType);return{tilejson:"3.0.0",scheme:"xyz",tiles:[`${e}/{z}/{x}/{y}${i}`],vector_layers:n.vector_layers,attribution:n.attribution,description:n.description,name:n.name,version:n.version,bounds:[r.minLon,r.minLat,r.maxLon,r.maxLat],center:[r.centerLon,r.centerLat,r.centerZoom],minzoom:r.minZoom,maxzoom:r.maxZoom}})}};d(lt,"PMTiles");var
          ne=lt;var
          ut=(t,e)=>e?e.replaceAll("{name}",t):t+".pmtiles",Wr=/^\/(?<NAME>[0-9a-zA-Z\/!\-_\.\*\'\(\)]+)\/(?<Z>\d+)\/(?<X>\d+)\/(?<Y>\d+).(?<EXT>[a-z]+)$/,Vr=/^\/(?<NAME>[0-9a-zA-Z\/!\-_\.\*\'\(\)]+).json$/,ct=t=>{let
          e=t.match(Wr);if(e){let
          n=e.groups;return{ok:!0,name:n.NAME,tile:[+n.Z,+n.X,+n.Y],ext:n.EXT}}let
          r=t.match(Vr);return
          r?{ok:!0,name:r.groups.NAME,ext:"json"}:{ok:!1,name:"",tile:[0,0,0],ext:""}};var
          nr=require("crypto"),ze=Be(require("zlib")),ce=require("@aws-sdk/client-s3"),ir=Be(rr()),ri=new
          ce.S3Client({requestHandler:new
          ir.NodeHttpHandler({connectionTimeout:500,socketTimeout:500})});async
          function or(t,e){if(e===Y.None||e===Y.Unknown)return
          t;if(e===Y.Gzip)return ze.default.gunzipSync(t);throw new
          Error("Compression method not supported")}var ni=new st(void 0,void
          0,or),Se=class{constructor(e){this.archiveName=e}getKey(){return
          this.archiveName}async getBytes(e,r,n,i){let o;try{o=await ri.send(new
          ce.GetObjectCommand({Bucket:process.env.BUCKET,Key:ut(this.archiveName,process.env.PMTILES_PATH),Range:"bytes="+e+"-"+(e+r-1),IfMatch:i,RequestPayer:"requester"}))}catch(a){throw
          a instanceof Error&&a.name==="PreconditionFailed"?new Q:a}let s=await
          o.Body?.transformToByteArray();if(!s)throw new Error("Failed to read
          S3 response
          body");return{data:s.buffer,etag:o.ETag,expires:o.Expires?.toISOString(),cacheControl:o.CacheControl}}},U=(t,e,r=!1,n={})=>({statusCode:t,body:e,headers:n,isBase64Encoded:r}),sr=async(t,e,r)=>{let
          n,i=!1;if(t.pathParameters)if(i=!0,t.pathParameters.proxy)n=`/${t.pathParameters.proxy}`;else
          return U(500,"Proxy integration missing tile_path parameter");else
          n=t.rawPath;if(!n)return U(500,"Invalid event configuration");let
          o={};process.env.CORS&&(o["Access-Control-Allow-Origin"]=process.env.CORS);let{ok:s,name:a,tile:l,ext:h}=ct(n);if(!s)return
          U(400,"Invalid tile URL",!1,o);let f=new Se(a),u=new
          ne(f,ni,or);try{let c=await
          u.getHeader();if(!l){if(!(process.env.PUBLIC_HOSTNAME||t.headers["x-distribution-domain-name"]))return
          U(501,"PUBLIC_HOSTNAME must be set for
          TileJSON",!1,o);o["Content-Type"]="application/json";let w=await
          u.getTileJson(`https://${process.env.PUBLIC_HOSTNAME||t.headers["x-distribution-domain-name"]||""}/${a}`);return
          U(200,JSON.stringify(w),!1,o)}if(l[0]<c.minZoom||l[0]>c.maxZoom)return
          U(404,"",!1,o);let
          T={mvt:z.Mvt,pbf:z.Mvt,png:z.Png,jpg:z.Jpeg,webp:z.Webp,avif:z.Avif}[h];if(c.tileType!==T&&X(c.tileType)!=="")return
          U(400,`Bad request: requested .${h} but archive has type
          ${X(c.tileType)}`,!1,o);let m=await
          u.getZxy(l[0],l[1],l[2]);if(m){switch(c.tileType){case
          z.Mvt:o["Content-Type"]="application/vnd.mapbox-vector-tile";break;case
          z.Png:o["Content-Type"]="image/png";break;case
          z.Jpeg:o["Content-Type"]="image/jpeg";break;case
          z.Webp:o["Content-Type"]="image/webp";break;case
          z.Avif:o["Content-Type"]="image/avif";break}let
          w=m.data;if(r&&(w=r(w,c.tileType)),o["Cache-Control"]=process.env.CACHE_CONTROL||"public,
          max-age=86400",o.ETag=`"${(0,nr.createHash)("sha256").update(Buffer.from(w)).digest("hex")}"`,i){let
          H=ze.default.gzipSync(w);return
          o["Content-Encoding"]="gzip",U(200,Buffer.from(H).toString("base64"),!0,o)}return
          U(200,Buffer.from(w).toString("base64"),!0,o)}return
          U(204,"",!1,o)}catch(c){if(c.name==="AccessDenied")return
          U(403,"Bucket access unauthorized",!1,o);throw
          c}},ii=async(t,e)=>await
          sr(t,e);0&&(module.exports={handler,handlerRaw});