[taler-taldir] branch master updated: add qr code generation

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martin-schanzenbach pushed a commit to branch master
in repository taldir.

The following commit(s) were added to refs/heads/master by this push:
     new 6fd9c18  add qr code generation
6fd9c18 is described below

commit 6fd9c1815caefdf8d66dfe03d7e5430e73db6eb3
Author: Martin Schanzenbach <schanzen@gnunet.org>
AuthorDate: Tue Jul 5 13:34:35 2022 +0200

    add qr code generation
---
 go.mod    |  1 +
 taldir.go | 28 +++++++++++++++++++++++++++-
 test.sh   |  2 ++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/go.mod b/go.mod
index 00078d6..7d1e166 100644
--- a/go.mod
+++ b/go.mod
@@ -7,6 +7,7 @@ require (
        github.com/gorilla/mux v1.8.0
        github.com/jcmturner/gokrb5/v8 v8.2.0 // indirect
        github.com/jinzhu/now v1.1.5 // indirect
+       github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
        golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect
        gopkg.in/ini.v1 v1.66.4
        gopkg.in/jcmturner/aescts.v1 v1.0.1 // indirect
diff --git a/taldir.go b/taldir.go
index 302a1fb..d8b19e0 100644
--- a/taldir.go
+++ b/taldir.go
@@ -7,15 +7,18 @@ import (
   "fmt"
   "log"
   "net/http"
+  "html/template"
   "encoding/json"
   "github.com/gorilla/mux"
   "gorm.io/gorm"
   "encoding/base32"
+  "encoding/base64"
   "math/rand"
   "crypto/sha512"
   "gorm.io/driver/postgres"
   "gopkg.in/ini.v1"
   "strings"
+  "github.com/skip2/go-qrcode"
 )
 
 type VersionResponse struct {
@@ -153,6 +156,9 @@ var cfg *ini.File
 // Map of supported validators as defined in the configuration
 var validators map[string]bool
 
+// landing page
+var validationTpl *template.Template
+
 // Primary lookup function.
 // Allows the caller to query a wallet key using the hash(!) of the
 // identity, e.g. sha256(<email address>)
@@ -377,7 +383,23 @@ func configResponse(w http.ResponseWriter, r 
*http.Request) {
 }
 
 func validationPage(w http.ResponseWriter, r *http.Request) {
-  // FIXME provided HTML page here
+  vars := mux.Vars(r)
+  w.Header().Set("Content-Type", "text/html; charset=utf-8")
+  var walletLink string
+  walletLink = "taler://taldir/" + vars["h_address"] + "/" + 
vars["validation_code"] + "-wallet"
+  var png []byte
+  png, err := qrcode.Encode(walletLink, qrcode.Medium, 256)
+  if err != nil {
+    w.WriteHeader(500)
+    return
+  }
+  encodedPng := base64.StdEncoding.EncodeToString(png)
+
+  fullData := map[string]interface{}{
+    "QRCode": template.URL("data:image/png;base64," + encodedPng),
+    "WalletLink": template.URL(walletLink),
+  }
+  validationTpl.Execute(w, fullData)
   return
 }
 
@@ -434,5 +456,9 @@ func main() {
   if err := db.AutoMigrate(&Validation{}); err != nil {
     panic(err)
   }
+  validationTpl, err = template.ParseFiles("templates/validation_landing.html")
+  if err != nil {
+    fmt.Println(err)
+  }
   handleRequests()
 }
diff --git a/test.sh b/test.sh
index de0e45d..411fcba 100755
--- a/test.sh
+++ b/test.sh
@@ -6,6 +6,8 @@ CODE=`cat validation_code`
 H_ADDRESS=`echo -n abc@test | openssl dgst -binary -sha512 | base32 -w0`
 echo "Code: $CODE; Address: $H_ADDRESS"
 # Validate
+echo localhost:11000/register/$H_ADDRESS/$CODE
+exit
 curl -v localhost:11000/$H_ADDRESS --data "{\"solution\": \"${CODE}\"}"
 # Get mapping
 curl -v localhost:11000/$H_ADDRESS

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