Added custom headers option

Dockerfile

@@ -19,9 +19,6 @@ RUN apk add --no-cache libwebp libstdc++
 
 COPY --from=builder /app/quay .
 
-RUN mkdir -p /storage /config && \
-    chmod -R 755 /storage /config
-
 ENV PORT=4321
 ENV CONFIG_DIR=/config
 ENV STORAGE_PATH=/storage

app/handlers/static.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"os"
+	"path"
 	"path/filepath"
 	"quay/internal/config"
 
@@ -15,7 +16,38 @@ func NewStaticHandler(storagePath string, siteMap map[string]config.SiteConfig)
 			return c.Status(fiber.StatusNotFound).SendString("Site not found")
 		}
 
+		if !site.Enabled {
+			return c.Status(fiber.StatusServiceUnavailable).SendString("Site is currently unavailable")
+		}
+
 		urlPath := filepath.Clean(c.Path())
+
+		for _, header := range site.CustomHeaders {
+			var matched bool
+			if header.Regex && header.Compiled != nil {
+				matched = header.Compiled.MatchString(urlPath)
+			} else {
+				matched, _ = path.Match(header.Source, urlPath)
+			}
+			if matched {
+				for key, value := range header.Headers {
+					c.Set(key, value)
+				}
+			}
+		}
+
+		for _, rule := range site.ForwardRules {
+			if rule.Regex && rule.Compiled != nil {
+				match := rule.Compiled.FindStringSubmatchIndex(urlPath)
+				if match != nil {
+					dest := rule.Compiled.ExpandString([]byte{}, rule.Destination, urlPath, match)
+					return c.Redirect().Status(rule.StatusCode).To(string(dest))
+				}
+			} else if rule.Source == urlPath {
+				return c.Redirect().Status(rule.StatusCode).To(rule.Destination)
+			}
+		}
+
 		if urlPath == "/" || urlPath == "." {
 			urlPath = "/index.html"
 		}

config.example.yaml

@@ -8,6 +8,29 @@ sites:
     branch: gh-pages
     domain: docs.my-lib.com
     deploy_token: "${MY_LIB_DEPLOY_TOKEN}"
+    enabled: true
+    not_found_file: 404.html
+    forward_rules:
+      - source: /npm
+        destination: https://www.npmjs.com/package/my-lib
+        status_code: 302
+      - source: ^/docs/v(\d+)$
+        destination: https://v$1.docs.my-lib.com/
+        status_code: 301
+        regex: true
+      - source: ^/blog/(?P<slug>[^/]+)$
+        destination: /posts/${slug}
+        status_code: 302
+        regex: true
+    custom_headers:
+      - source: /json/* # glob (default)
+        headers:
+          Content-Type: "application/json"
+          Cache-Control: "max-age=7200, must-revalidate"
+      - source: ^/api/v\d+/ # regex opt-in
+        regex: true
+        headers:
+          Cache-Control: "no-store"
 
   - repo: portfolio
     owner: yourname
@@ -15,9 +38,11 @@ sites:
     domain: yourname.com
     spa: true
     deploy_token: "${PORTFOLIO_DEPLOY_TOKEN}"
+    enabled: true
 
   - repo: other-docs
     owner: yourname
     branch: gh-pages
     domain: other-docs.yourdomain.com
-    deploy_token: "${OTHER_DOCS_DEPLOY_TOKEN}"
+    deploy_token: "${OTHER_DOCS_DEPLOY_TOKEN}"
+    enabled: true

internal/config/config.go

@@ -1,20 +1,42 @@
 package config
 
 import (
+	"fmt"
 	"os"
+	"path"
+	"regexp"
+	"strconv"
 
 	"gopkg.in/yaml.v3"
 )
 
+type ForwardRule struct {
+	Source      string `yaml:"source"`
+	Destination string `yaml:"destination"`
+	StatusCode  int    `yaml:"status_code"`
+	Regex       bool   `yaml:"regex"`
+	Compiled    *regexp.Regexp
+}
+
+type CustomHeader struct {
+	Source   string            `yaml:"source"`
+	Regex    bool              `yaml:"regex"`
+	Headers  map[string]string `yaml:"headers"`
+	Compiled *regexp.Regexp
+}
+
 type SiteConfig struct {
-	Name         string `yaml:"name"`
-	Repo         string `yaml:"repo"`
-	Owner        string `yaml:"owner"`
-	Branch       string `yaml:"branch"`
-	Domain       string `yaml:"domain"`
-	SPA          bool   `yaml:"spa"`
-	NotFoundFile string `yaml:"not_found_file"`
-	DeployToken  string `yaml:"deploy_token"`
+	Name          string         `yaml:"name"`
+	Repo          string         `yaml:"repo"`
+	Owner         string         `yaml:"owner"`
+	Branch        string         `yaml:"branch"`
+	Domain        string         `yaml:"domain"`
+	Enabled       bool           `yaml:"enabled"`
+	SPA           bool           `yaml:"spa"`
+	NotFoundFile  string         `yaml:"not_found_file"`
+	DeployToken   string         `yaml:"deploy_token"`
+	ForwardRules  []ForwardRule  `yaml:"forward_rules"`
+	CustomHeaders []CustomHeader `yaml:"custom_headers"`
 }
 
 type Config struct {
@@ -33,19 +55,68 @@ func (c Error) Error() string {
 func validateConfig(config *Config) error {
 	for i, site := range config.Sites {
 		if site.Name == "" {
-			return &Error{Field: "sites[" + string(i) + "].name", Message: "Name is required"}
+			return &Error{Field: "sites[" + strconv.Itoa(i) + "].name", Message: "Name is required"}
 		}
 		if site.Repo == "" {
-			return &Error{Field: "sites[" + string(i) + "].repo", Message: "Repo is required"}
+			return &Error{Field: "sites[" + strconv.Itoa(i) + "].repo", Message: "Repo is required"}
 		}
 		if site.Owner == "" {
-			return &Error{Field: "sites[" + string(i) + "].owner", Message: "Owner is required"}
+			return &Error{Field: "sites[" + strconv.Itoa(i) + "].owner", Message: "Owner is required"}
 		}
 		if site.Branch == "" {
-			return &Error{Field: "sites[" + string(i) + "].branch", Message: "Branch is required"}
+			return &Error{Field: "sites[" + strconv.Itoa(i) + "].branch", Message: "Branch is required"}
 		}
 		if site.Domain == "" {
-			return &Error{Field: "sites[" + string(i) + "].domain", Message: "Domain is required"}
+			return &Error{Field: "sites[" + strconv.Itoa(i) + "].domain", Message: "Domain is required"}
+		}
+		for j, rule := range site.ForwardRules {
+			if rule.Source == "" {
+				return &Error{Field: "sites[" + strconv.Itoa(i) + "].forward_rules[" + strconv.Itoa(j) + "].source", Message: "Source is required"}
+			}
+			if rule.Destination == "" {
+				return &Error{Field: "sites[" + strconv.Itoa(i) + "].forward_rules[" + strconv.Itoa(j) + "].destination", Message: "Destination is required"}
+			}
+			if rule.StatusCode == 0 {
+				return &Error{Field: "sites[" + strconv.Itoa(i) + "].forward_rules[" + strconv.Itoa(j) + "].status_code", Message: "Status code is required"}
+			}
+			if rule.StatusCode < 300 || rule.StatusCode >= 400 {
+				return &Error{Field: "sites[" + strconv.Itoa(i) + "].forward_rules[" + strconv.Itoa(j) + "].status_code", Message: "Status code must be a valid redirect code (300-399)"}
+			}
+			if rule.Regex {
+				re, err := regexp.Compile(rule.Source)
+				if err != nil {
+					return &Error{
+						Field:   fmt.Sprintf("sites[%d].forward_rules[%d].source", i, j),
+						Message: "Invalid regex: " + err.Error(),
+					}
+				}
+				config.Sites[i].ForwardRules[j].Compiled = re
+			}
+		}
+		for k, header := range site.CustomHeaders {
+			if header.Source == "" {
+				return &Error{Field: fmt.Sprintf("sites[%d].custom_headers[%d].source", i, k), Message: "Source is required"}
+			}
+			if len(header.Headers) == 0 {
+				return &Error{Field: fmt.Sprintf("sites[%d].custom_headers[%d].headers", i, k), Message: "At least one header is required"}
+			}
+			if header.Regex {
+				re, err := regexp.Compile(header.Source)
+				if err != nil {
+					return &Error{
+						Field:   fmt.Sprintf("sites[%d].custom_headers[%d].source", i, k),
+						Message: "Invalid regex: " + err.Error(),
+					}
+				}
+				config.Sites[i].CustomHeaders[k].Compiled = re
+			} else {
+				if _, err := path.Match(header.Source, ""); err != nil {
+					return &Error{
+						Field:   fmt.Sprintf("sites[%d].custom_headers[%d].source", i, k),
+						Message: "Invalid glob pattern: " + err.Error(),
+					}
+				}
+			}
 		}
 	}
 	return nil
@@ -56,6 +127,11 @@ func applyDefaults(config *Config) {
 		if config.Sites[i].NotFoundFile == "" {
 			config.Sites[i].NotFoundFile = "404.html"
 		}
+		for j := range config.Sites[i].ForwardRules {
+			if config.Sites[i].ForwardRules[j].StatusCode == 0 {
+				config.Sites[i].ForwardRules[j].StatusCode = 302
+			}
+		}
 	}
 }
 
@@ -64,7 +140,13 @@ func Load(path string) (*Config, error) {
 	if err != nil {
 		return nil, err
 	}
-	expanded := os.Expand(string(f), os.Getenv)
+	expanded := os.Expand(string(f), func(key string) string {
+		val, ok := os.LookupEnv(key)
+		if !ok {
+			return "${" + key + "}" // env vars that aren't set are left as is to not cause errors with regex patterns
+		}
+		return val
+	})
 	var config Config
 	err = yaml.Unmarshal([]byte(expanded), &config)
 	if err != nil {