releaser: read config from files instead of variables

Signed-off-by: David Karlsson <[email protected]>

Author: dvdksn

_releaser/Dockerfile

@@ -5,7 +5,7 @@ ARG GO_VERSION=1.19
 FROM scratch AS sitedir
 
 FROM golang:${GO_VERSION}-alpine AS base
-RUN apk add --no-cache jq openssl
+RUN apk add --no-cache openssl
 ENV CGO_ENABLED=0
 WORKDIR /src
 COPY go.mod go.sum ./
@@ -42,13 +42,13 @@ FROM base AS aws-cloudfront-update
 ARG AWS_REGION
 ARG AWS_LAMBDA_FUNCTION
 ARG AWS_CLOUDFRONT_ID
+ARG AWS_LAMBDA_FUNCTION_FILE="cloudfront-lambda-redirects.js"
+ARG REDIRECTS_FILE="/site/redirects.json"
+ARG REDIRECTS_PREFIXES_FILE="redirects-prefixes.json"
 RUN --mount=type=bind,target=. \
   --mount=type=bind,from=sitedir,target=/site \
   --mount=type=bind,from=releaser,source=/out/releaser,target=/usr/bin/releaser \
   --mount=type=secret,id=AWS_ACCESS_KEY_ID \
   --mount=type=secret,id=AWS_SECRET_ACCESS_KEY \
   --mount=type=secret,id=AWS_SESSION_TOKEN \
-  AWS_LAMBDA_FUNCTION_FILE=cloudfront-lambda-redirects.js \
-  REDIRECTS_JSON=$(jq -c '.' /site/redirects.json) \
-  REDIRECTS_PREFIXES_JSON=$(jq -c '.' redirects-prefixes.json) \
   releaser aws cloudfront-update

_releaser/aws.go

@@ -100,15 +100,15 @@ type AwsCloudfrontUpdateCmd struct {
 	Function              string `kong:"name='lambda-function',env='AWS_LAMBDA_FUNCTION'"`
 	FunctionFile          string `kong:"name='lambda-function-file',env='AWS_LAMBDA_FUNCTION_FILE'"`
 	CloudfrontID          string `kong:"name='cloudfront-id',env='AWS_CLOUDFRONT_ID'"`
-	RedirectsJSON         string `kong:"name='redirects-json',env='REDIRECTS_JSON'"`
-	RedirectsPrefixesJSON string `kong:"name='redirects-prefixes-json',env='REDIRECTS_PREFIXES_JSON'"`
+	RedirectsFile         string `kong:"name='redirects-file',env='REDIRECTS_FILE'"`
+	RedirectsPrefixesFile string `kong:"name='redirects-prefixes-file',env='REDIRECTS_PREFIXES_FILE'"`
 }
 
 func (s *AwsCloudfrontUpdateCmd) Run() error {
 	var err error
 	ver := time.Now().UTC().Format(time.RFC3339)
 
-	zipdt, err := getLambdaFunctionZip(s.FunctionFile, s.RedirectsJSON, s.RedirectsPrefixesJSON)
+	zipdt, err := getLambdaFunctionZip(s.FunctionFile, s.RedirectsFile, s.RedirectsPrefixesFile)
 	if err != nil {
 		return fmt.Errorf("cannot create lambda function zip: %w", err)
 	}
@@ -228,20 +228,30 @@ func (s *AwsCloudfrontUpdateCmd) Run() error {
 	return nil
 }
 
-func getLambdaFunctionZip(funcFilename string, redirectsJSON string, redirectsPrefixesJSON string) ([]byte, error) {
+func getLambdaFunctionZip(funcFilename, redirectsFile, redirectsPrefixesFile string) ([]byte, error) {
 	funcdt, err := os.ReadFile(funcFilename)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read lambda function file %q: %w", funcFilename, err)
 	}
 
+	redirects, err := os.ReadFile(redirectsFile)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read redirects file %q: %w", redirectsFile, err)
+	}
+
+	redirectsPrefixes, err := os.ReadFile(redirectsPrefixesFile)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read redirects prefixes file %q: %w", redirectsPrefixesFile, err)
+	}
+
 	var funcbuf bytes.Buffer
 	functpl := template.Must(template.New("").Parse(string(funcdt)))
 	if err = functpl.Execute(&funcbuf, struct {
 		RedirectsJSON         string
 		RedirectsPrefixesJSON string
 	}{
-		redirectsJSON,
-		redirectsPrefixesJSON,
+		string(redirects),
+		string(redirectsPrefixes),
 	}); err != nil {
 		return nil, err
 	}