Implement merge strategy

Dockerfile

@@ -1,11 +1,20 @@
-FROM alpine:3.16
+FROM docker.io/library/golang:1.19-alpine3.16 as builder
+
+# hadolint ignore=DL3018
+RUN apk add --no-cache build-base && \
+    go install -ldflags "-s -w" -trimpath git.worn.eu/guru/squid-rewriter@latest
+
+#############################################################################
+
+FROM docker.io/library/alpine:3.16
 
 # hadolint ignore=DL3018
 RUN apk add --no-cache squid openssl darkhttpd
-COPY run.sh rewrite.awk /
+COPY run.sh /
 COPY install-ca.sh /static/
-COPY squid.conf /etc/squid/squid.conf
-RUN chmod 0755 /run.sh /rewrite.awk ; mkdir /ca
+COPY squid.conf rewrites.yaml /etc/squid/
+COPY --from=builder /go/bin/squid-rewriter /usr/local/bin/
+RUN chmod 0755 /run.sh /usr/local/bin/squid-rewriter ; mkdir /ca
 
 VOLUME /var/cache/squid
 EXPOSE 3128

rewrite.awk

@@ -1,21 +0,0 @@
-#!/usr/bin/awk -f
-
-function handle_request(url, ip_fqdn, ident, method, kwargs)
-{
-    if (index(url, "http://proxy/") == 1) {
-        sub(/http:\/\/proxy\//, "http://127.0.0.1:9999/", url)
-        return "OK rewrite-url=" url
-    }
-    return "OK"
-}
-
-$1 ~ /^[0-9]+$/ {request_id=$1 " "; request_url=$2; request_ip_fqdn=$3; request_ident=$4; request_method=$5; first_pair=6}
-$1 !~ /^[0-9]+$/ {request_id=""; request_url=$1; request_ip_fqdn=$2; request_ident=$3; request_method=$4; first_pair=5}
-{
-    split("", kv);
-    for (i=first_pair; i<=NF; i++) {
-        split($i, parts, sep="=")
-        kv[parts[1]]=parts[2]
-    }
-    print request_id handle_request(request_url, request_ip_fqdn, request_ident, request_method, kv)
-}

rewrites.yaml

@@ -0,0 +1,31 @@
+---
+# This is an example rewrite rules file
+rewrites:
+  - name: static
+    urls:
+      - http://proxy/
+    destination: http://127.0.0.1:9999/
+  - name: alpine
+    distro: alpine
+    destination: https://dl-cdn.alpinelinux.org/alpine/
+  - name: debian
+    distro: debian
+    destination: http://deb.debian.org/debian/
+  - name: arch
+    distro: arch
+    destination: https://geo.mirror.pkgbuild.com/
+  - name: fedora
+    distro: fedora
+    destination: https://fedora.mirrorservice.org/fedora/linux/
+  - name: fedora
+    distro: fedora:epel
+    destination: https://fedora.mirrorservice.org/epel/
+  - name: ubuntu
+    distro: ubuntu
+    destination: http://archive.ubuntu.com/ubuntu/
+  - name: mint
+    distro: mint
+    destination: https://mirrors.layeronline.com/linuxmint/
+  - name: slackware
+    distro: slackware
+    destination: https://www.mirrorservice.org/sites/ftp.slackware.com/pub/slackware/

run.sh

@@ -33,4 +33,11 @@ done
     squid -s
 ) &
 
+(
+    sleep 3
+    # Force the spawning of the rewrite process to avoid slowing down the first
+    # client request
+    http_proxy=http://127.0.0.1:3128 wget -qO /dev/null http://proxy/ca.crt
+) &
+
 syslogd -n -O -

squid.conf

@@ -48,8 +48,8 @@ refresh_pattern \.apk$ 129600 100% 129600
 refresh_pattern \.(tar|iso)(\.[zZ]|\.gz|\.bz2?|\.xz|\.zstd?)?(\.sig)?$ 129600 100% 129600
 refresh_pattern . 0 20% 4320
 
-url_rewrite_children 4
-url_rewrite_program /rewrite.awk
+url_rewrite_children 1
+url_rewrite_program /usr/local/bin/squid-rewriter
 
 sslcrtd_program /usr/lib/squid/security_file_certgen -s /certs/ssl_db -M 4MB
 acl step1 at_step SslBump1