[taler-anastasis] 02/03: ahv number validation function

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dennis-neufeld pushed a commit to branch master
in repository anastasis.

commit f4986cd16d66b3e807479f9a0e3d2678036d9c20
Author: Dennis Neufeld <dennis.neufeld@students.bfh.ch>
AuthorDate: Sun Nov 1 19:21:21 2020 +0100

    ahv number validation function
---
 contrib/redux.ch.json         | 19 +++++++-------
 src/lib/anastasis_api_redux.c | 59 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 10 deletions(-)

diff --git a/contrib/redux.ch.json b/contrib/redux.ch.json
index e434037..677b800 100644
--- a/contrib/redux.ch.json
+++ b/contrib/redux.ch.json
@@ -3,8 +3,8 @@
        {
            "type": "string",
            "name": "full_name",
-               "label": "Full name",
-               "label_i18n":{
+                 "label": "Full name",
+                 "label_i18n":{
                                                "de_DE":"Vollstaendiger Name",
                                                "de_CH":"Vollstaendiger Name"
                                         },
@@ -13,21 +13,20 @@
        {
            "type": "date",
            "name": "birthdate",
-               "label": "Birthdate",
+                 "label": "Birthdate",
            "label_i18n":{"de_CH":"Geburtsdatum"},
            "widget": "anastasis_gtk_ia_birthdate"
        },
        {
-           "type": "string",
-           "name": "ahv_number",
-               "label": "AHV number",
-               "label_i18n":{
+      "type": "string",
+      "name": "ahv_number",
+                 "label": "AHV number",
+                 "label_i18n":{
                                                "de_DE":"AHV-Nummer",
                                                "de_CH":"AHV-Nummer"
                                         },
-           "widget": "anastasis_gtk_ia_ahv"
+           "widget": "anastasis_gtk_ia_ahv",
+      "validation": "/(756.\d{4}.\d{4}.\d{2}|756\d{10})/g"
        }
        ]
 }
-
-
diff --git a/src/lib/anastasis_api_redux.c b/src/lib/anastasis_api_redux.c
index b362a3c..8091a58 100644
--- a/src/lib/anastasis_api_redux.c
+++ b/src/lib/anastasis_api_redux.c
@@ -408,6 +408,65 @@ ANASTASIS_redux_countries_init_ (void)
 }
 
 
+/**
+ * Function to validate an AHV number.
+ * @param ahv_number ahv number to validate
+ * @return true if validation passed, else false
+ */
+static bool
+validate_ahv (const char*ahv_number)
+{
+  unsigned int checknum;
+  char num_to_check[12];
+
+  // check if ahv contains points
+  if (strstr (ahv_number, "."))
+  {
+    for (unsigned int i = 0; i < 3; i++)
+    {
+      num_to_check[i] = ahv_number[i];
+    }
+    for (unsigned int i = 0; i < 4; i++)
+    {
+      num_to_check[3 + i] = ahv_number[4 + i];
+    }
+    for (unsigned int i = 0; i < 4; i++)
+    {
+      num_to_check[7 + i] = ahv_number[9 + i];
+    }
+    num_to_check[11] = ahv_number[15];
+  }
+  else
+  {
+    for (unsigned int i = 0; i < 12; i++)
+    {
+      num_to_check[i] = ahv_number[i];
+    }
+  }
+  int calculation = 0;
+  int next_ten = 0;
+  checknum = (int) ahv_number[strlen (ahv_number) - 1] - 48;
+
+  for (unsigned int i = 0; i < strlen (num_to_check); i++)
+  {
+    int x = (int) num_to_check[strlen (num_to_check) - i - 1] - 48;
+    if (0 == i % 2)
+      calculation = calculation + (x * 3);
+    else
+      calculation = calculation + x;
+  }
+  // round up to the next ten
+  next_ten = (calculation + 10) / 10;
+  next_ten = next_ten * 10;
+  // calculate check number
+  calculation = next_ten - calculation;
+
+  if (checknum == calculation)
+    return true;
+  return false;
+}
+
+
 /**
  * Function to load json containing country specific
  * identity attributes. Returns #GNUNET_OK if operation

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