From 6474565d976da6d980e7a91a133d45bca10e2412 Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Sun, 4 Dec 2016 20:29:41 +0100
Subject: Add HTTPInput

---
 manager.go | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

diff --git a/manager.go b/manager.go
index 3122b67..086740e 100644
--- a/manager.go
+++ b/manager.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"net/http"
 	"os"
 	"strings"
 	"sync"
@@ -25,6 +26,12 @@ type StdinInput struct {
 	retchan chan *Work
 }
 
+type HTTPInput struct {
+	retchan chan *Work
+	prefix  string
+	port    string
+}
+
 type Filter interface {
 	Filter(*Work) *Work
 }
@@ -71,10 +78,48 @@ func (i *StdinInput) Start() chan *Work {
 	return i.retchan
 }
 
+func (hi *HTTPInput) httphandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != "POST" {
+		fmt.Printf("Expected POST method was: %q\n", r.Method)
+		return
+	}
+	err := r.ParseForm()
+	if err != nil {
+		fmt.Printf("Error when parsing HTTP request form values: %q\n", err)
+		return
+	}
+	workdata := r.PostForm["work"]
+	fmt.Printf("Form %#v\n", r.Form)
+	if workdata == nil {
+		fmt.Printf("Work form field was empty.\n")
+		return
+	}
+
+	fmt.Printf("Work form field was: %q\n", workdata)
+	hi.retchan <- &Work{data: []byte(workdata[0])}
+}
+
+func (hi *HTTPInput) Start() chan *Work {
+	hi.retchan = make(chan *Work, 100)
+
+	go func() {
+		http.HandleFunc("/"+hi.prefix, hi.httphandler)
+		err := http.ListenAndServe(hi.port, nil)
+		fmt.Printf("Error when serving HTTP: %q\n", err)
+		close(hi.retchan)
+	}()
+
+	return hi.retchan
+}
+
 func NewStringFilter(ffmap map[string]func(string) string) *StringFilter {
 	return &StringFilter{FilterFuncMap: ffmap}
 }
 
+func NewHTTPInput(prefix, port string) *HTTPInput {
+	return &HTTPInput{prefix: prefix, port: port}
+}
+
 func (f *StringFilter) Filter(w *Work) *Work {
 	dec := json.NewDecoder(bytes.NewReader(w.data))
 	jm := make(map[string]string, 10)
@@ -144,7 +189,7 @@ func main() {
 	ffmap["F"] = func(s string) string { return strings.ToUpper(s) }
 
 	m := Manager{
-		Input:  &StdinInput{},
+		Input:  NewHTTPInput("", ":8080"),
 		Filter: NewStringFilter(ffmap),
 		Output: &StdoutOutput{},
 	}
-- 
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