From 50e62d06bcbc6b6486b382a22c633772443cfb6d Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Mon, 9 Sep 2019 12:23:27 -0600
Subject: reverse_proxy: Caddyfile integration (and fix blocks in Dispenser)

---
 modules/caddyhttp/reverseproxy/caddyfile.go        | 486 +++++++++++++++++++++
 .../caddyhttp/reverseproxy/fastcgi/caddyfile.go    |  54 +++
 2 files changed, 540 insertions(+)
 create mode 100644 modules/caddyhttp/reverseproxy/caddyfile.go
 create mode 100644 modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go

(limited to 'modules/caddyhttp')

diff --git a/modules/caddyhttp/reverseproxy/caddyfile.go b/modules/caddyhttp/reverseproxy/caddyfile.go
new file mode 100644
index 0000000..ffa3ca0
--- /dev/null
+++ b/modules/caddyhttp/reverseproxy/caddyfile.go
@@ -0,0 +1,486 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package reverseproxy
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/caddyconfig"
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+	"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
+	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
+	"github.com/dustin/go-humanize"
+)
+
+func init() {
+	httpcaddyfile.RegisterHandlerDirective("reverse_proxy", parseCaddyfile)
+}
+
+func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
+	rp := new(Handler)
+	err := rp.UnmarshalCaddyfile(h.Dispenser)
+	if err != nil {
+		return nil, err
+	}
+	return rp, nil
+}
+
+// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
+//
+//     reverse_proxy [<matcher>] [<upstreams...>] {
+//         # upstreams
+//         to <upstreams...>
+//
+//         # load balancing
+//         lb_policy <name> [<options...>]
+//         lb_try_duration <duration>
+//         lb_try_interval <interval>
+//
+//         # active health checking
+//         health_path <path>
+//         health_port <port>
+//         health_interval <interval>
+//         health_timeout <duration>
+//         health_status <status>
+//         health_body <regexp>
+//
+//         # passive health checking
+//         max_fails <num>
+//         fail_duration <duration>
+//         max_conns <num>
+//         unhealthy_status <status>
+//         unhealthy_latency <duration>
+//
+//         # round trip
+//         transport <name> {
+//             ...
+//         }
+//     }
+//
+func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	for d.Next() {
+		for _, up := range d.RemainingArgs() {
+			h.Upstreams = append(h.Upstreams, &Upstream{
+				Dial: up,
+			})
+		}
+
+		for d.NextBlock() {
+			switch d.Val() {
+			case "to":
+				args := d.RemainingArgs()
+				if len(args) == 0 {
+					return d.ArgErr()
+				}
+				for _, up := range args {
+					h.Upstreams = append(h.Upstreams, &Upstream{
+						Dial: up,
+					})
+				}
+
+			case "lb_policy":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.LoadBalancing != nil && h.LoadBalancing.SelectionPolicyRaw != nil {
+					return d.Err("load balancing selection policy already specified")
+				}
+				name := d.Val()
+				mod, err := caddy.GetModule("http.handlers.reverse_proxy.selection_policies." + name)
+				if err != nil {
+					return d.Errf("getting load balancing policy module '%s': %v", mod.Name, err)
+				}
+				unm, ok := mod.New().(caddyfile.Unmarshaler)
+				if !ok {
+					return d.Errf("load balancing policy module '%s' is not a Caddyfile unmarshaler", mod.Name)
+				}
+				err = unm.UnmarshalCaddyfile(d.NewFromNextTokens())
+				if err != nil {
+					return err
+				}
+				sel, ok := unm.(Selector)
+				if !ok {
+					return d.Errf("module %s is not a Selector", mod.Name)
+				}
+				if h.LoadBalancing == nil {
+					h.LoadBalancing = new(LoadBalancing)
+				}
+				h.LoadBalancing.SelectionPolicyRaw = caddyconfig.JSONModuleObject(sel, "policy", name, nil)
+
+			case "lb_try_duration":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.LoadBalancing == nil {
+					h.LoadBalancing = new(LoadBalancing)
+				}
+				dur, err := time.ParseDuration(d.Val())
+				if err != nil {
+					return d.Errf("bad duration value %s: %v", d.Val(), err)
+				}
+				h.LoadBalancing.TryDuration = caddy.Duration(dur)
+
+			case "lb_try_interval":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.LoadBalancing == nil {
+					h.LoadBalancing = new(LoadBalancing)
+				}
+				dur, err := time.ParseDuration(d.Val())
+				if err != nil {
+					return d.Errf("bad interval value '%s': %v", d.Val(), err)
+				}
+				h.LoadBalancing.TryInterval = caddy.Duration(dur)
+
+			case "health_path":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Active == nil {
+					h.HealthChecks.Active = new(ActiveHealthChecks)
+				}
+				h.HealthChecks.Active.Path = d.Val()
+
+			case "health_port":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Active == nil {
+					h.HealthChecks.Active = new(ActiveHealthChecks)
+				}
+				portNum, err := strconv.Atoi(d.Val())
+				if err != nil {
+					return d.Errf("bad port number '%s': %v", d.Val(), err)
+				}
+				h.HealthChecks.Active.Port = portNum
+
+			case "health_interval":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Active == nil {
+					h.HealthChecks.Active = new(ActiveHealthChecks)
+				}
+				dur, err := time.ParseDuration(d.Val())
+				if err != nil {
+					return d.Errf("bad interval value %s: %v", d.Val(), err)
+				}
+				h.HealthChecks.Active.Interval = caddy.Duration(dur)
+
+			case "health_timeout":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Active == nil {
+					h.HealthChecks.Active = new(ActiveHealthChecks)
+				}
+				dur, err := time.ParseDuration(d.Val())
+				if err != nil {
+					return d.Errf("bad timeout value %s: %v", d.Val(), err)
+				}
+				h.HealthChecks.Active.Timeout = caddy.Duration(dur)
+
+			case "health_status":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Active == nil {
+					h.HealthChecks.Active = new(ActiveHealthChecks)
+				}
+				val := d.Val()
+				if len(val) == 3 && strings.HasSuffix(val, "xx") {
+					val = val[:1]
+				}
+				statusNum, err := strconv.Atoi(val[:1])
+				if err != nil {
+					return d.Errf("bad status value '%s': %v", d.Val(), err)
+				}
+				h.HealthChecks.Active.ExpectStatus = statusNum
+
+			case "health_body":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Active == nil {
+					h.HealthChecks.Active = new(ActiveHealthChecks)
+				}
+				h.HealthChecks.Active.ExpectBody = d.Val()
+
+			case "max_fails":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Passive == nil {
+					h.HealthChecks.Passive = new(PassiveHealthChecks)
+				}
+				maxFails, err := strconv.Atoi(d.Val())
+				if err != nil {
+					return d.Errf("invalid maximum fail count '%s': %v", d.Val(), err)
+				}
+				h.HealthChecks.Passive.MaxFails = maxFails
+
+			case "fail_duration":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Passive == nil {
+					h.HealthChecks.Passive = new(PassiveHealthChecks)
+				}
+				dur, err := time.ParseDuration(d.Val())
+				if err != nil {
+					return d.Errf("bad duration value '%s': %v", d.Val(), err)
+				}
+				h.HealthChecks.Passive.FailDuration = caddy.Duration(dur)
+
+			case "unhealthy_request_count":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Passive == nil {
+					h.HealthChecks.Passive = new(PassiveHealthChecks)
+				}
+				maxConns, err := strconv.Atoi(d.Val())
+				if err != nil {
+					return d.Errf("invalid maximum connection count '%s': %v", d.Val(), err)
+				}
+				h.HealthChecks.Passive.UnhealthyRequestCount = maxConns
+
+			case "unhealthy_status":
+				args := d.RemainingArgs()
+				if len(args) == 0 {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Passive == nil {
+					h.HealthChecks.Passive = new(PassiveHealthChecks)
+				}
+				for _, arg := range args {
+					if len(arg) == 3 && strings.HasSuffix(arg, "xx") {
+						arg = arg[:1]
+					}
+					statusNum, err := strconv.Atoi(arg[:1])
+					if err != nil {
+						return d.Errf("bad status value '%s': %v", d.Val(), err)
+					}
+					h.HealthChecks.Passive.UnhealthyStatus = append(h.HealthChecks.Passive.UnhealthyStatus, statusNum)
+				}
+
+			case "unhealthy_latency":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.HealthChecks == nil {
+					h.HealthChecks = new(HealthChecks)
+				}
+				if h.HealthChecks.Passive == nil {
+					h.HealthChecks.Passive = new(PassiveHealthChecks)
+				}
+				dur, err := time.ParseDuration(d.Val())
+				if err != nil {
+					return d.Errf("bad duration value '%s': %v", d.Val(), err)
+				}
+				h.HealthChecks.Passive.UnhealthyLatency = caddy.Duration(dur)
+
+			case "transport":
+				if !d.NextArg() {
+					return d.ArgErr()
+				}
+				if h.TransportRaw != nil {
+					return d.Err("transport already specified")
+				}
+				name := d.Val()
+				mod, err := caddy.GetModule("http.handlers.reverse_proxy.transport." + name)
+				if err != nil {
+					return d.Errf("getting transport module '%s': %v", mod.Name, err)
+				}
+				unm, ok := mod.New().(caddyfile.Unmarshaler)
+				if !ok {
+					return d.Errf("transport module '%s' is not a Caddyfile unmarshaler", mod.Name)
+				}
+				d.Next() // consume the module name token
+				err = unm.UnmarshalCaddyfile(d.NewFromNextTokens())
+				if err != nil {
+					return err
+				}
+				rt, ok := unm.(http.RoundTripper)
+				if !ok {
+					return d.Errf("module %s is not a RoundTripper", mod.Name)
+				}
+				h.TransportRaw = caddyconfig.JSONModuleObject(rt, "protocol", name, nil)
+
+			default:
+				return d.Errf("unrecognized subdirective %s", d.Val())
+			}
+		}
+	}
+
+	return nil
+}
+
+// UnmarshalCaddyfile deserializes Caddyfile tokens into h.
+//
+//     transport http {
+//         read_buffer  <size>
+//         write_buffer <size>
+//         dial_timeout <duration>
+//         tls_client_auth <cert_file> <key_file>
+//         tls_insecure_skip_verify
+//         tls_timeout <duration>
+//         keepalive [off|<duration>]
+//         keepalive_idle_conns <max_count>
+//     }
+//
+func (h *HTTPTransport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	for d.NextBlock() {
+		switch d.Val() {
+		case "read_buffer":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			size, err := humanize.ParseBytes(d.Val())
+			if err != nil {
+				return d.Errf("invalid read buffer size '%s': %v", d.Val(), err)
+			}
+			h.ReadBufferSize = int(size)
+
+		case "write_buffer":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			size, err := humanize.ParseBytes(d.Val())
+			if err != nil {
+				return d.Errf("invalid write buffer size '%s': %v", d.Val(), err)
+			}
+			h.WriteBufferSize = int(size)
+
+		case "dial_timeout":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			dur, err := time.ParseDuration(d.Val())
+			if err != nil {
+				return d.Errf("bad timeout value '%s': %v", d.Val(), err)
+			}
+			h.DialTimeout = caddy.Duration(dur)
+
+		case "tls_client_auth":
+			args := d.RemainingArgs()
+			if len(args) != 2 {
+				return d.ArgErr()
+			}
+			if h.TLS == nil {
+				h.TLS = new(TLSConfig)
+			}
+			h.TLS.ClientCertificateFile = args[0]
+			h.TLS.ClientCertificateKeyFile = args[1]
+
+		case "tls_insecure_skip_verify":
+			if d.NextArg() {
+				return d.ArgErr()
+			}
+			if h.TLS == nil {
+				h.TLS = new(TLSConfig)
+			}
+			h.TLS.InsecureSkipVerify = true
+
+		case "tls_timeout":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			dur, err := time.ParseDuration(d.Val())
+			if err != nil {
+				return d.Errf("bad timeout value '%s': %v", d.Val(), err)
+			}
+			if h.TLS == nil {
+				h.TLS = new(TLSConfig)
+			}
+			h.TLS.HandshakeTimeout = caddy.Duration(dur)
+
+		case "keepalive":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			if h.KeepAlive == nil {
+				h.KeepAlive = new(KeepAlive)
+			}
+			if d.Val() == "off" {
+				var disable bool
+				h.KeepAlive.Enabled = &disable
+			}
+			dur, err := time.ParseDuration(d.Val())
+			if err != nil {
+				return d.Errf("bad duration value '%s': %v", d.Val(), err)
+			}
+			h.KeepAlive.IdleConnTimeout = caddy.Duration(dur)
+
+		case "keepalive_idle_conns":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			num, err := strconv.Atoi(d.Val())
+			if err != nil {
+				return d.Errf("bad integer value '%s': %v", d.Val(), err)
+			}
+			if h.KeepAlive == nil {
+				h.KeepAlive = new(KeepAlive)
+			}
+			h.KeepAlive.MaxIdleConns = num
+
+		default:
+			return d.Errf("unrecognized subdirective %s", d.Val())
+		}
+	}
+	return nil
+}
+
+// Interface guards
+var (
+	_ caddyfile.Unmarshaler = (*Handler)(nil)
+	_ caddyfile.Unmarshaler = (*HTTPTransport)(nil)
+)
diff --git a/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go b/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go
new file mode 100644
index 0000000..c8b9f63
--- /dev/null
+++ b/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go
@@ -0,0 +1,54 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fastcgi
+
+import "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+
+// UnmarshalCaddyfile deserializes Caddyfile tokens into h.
+//
+//     transport fastcgi {
+//         root <path>
+//         split <at>
+//         env <key> <value>
+//     }
+//
+func (t *Transport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	for d.NextBlock() {
+		switch d.Val() {
+		case "root":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			t.Root = d.Val()
+
+		case "split":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			t.SplitPath = d.Val()
+
+		case "env":
+			args := d.RemainingArgs()
+			if len(args) != 2 {
+				return d.ArgErr()
+			}
+			t.EnvVars = append(t.EnvVars, [2]string{args[0], args[1]})
+
+		default:
+			return d.Errf("unrecognized subdirective %s", d.Val())
+		}
+	}
+	return nil
+}
-- 
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