* Fixed bug with MySQL database varchar length limitations

* Added build payment URI tag, to help you generate payment URIs to feed into any QR Code generator

Author: CryptAPI

README.md

@@ -128,6 +128,17 @@ You just need to load ``cryptapi_helper`` on your template and use the following
 
 ``{{ coin|coin_name }}`` will output the properly formatted cryptocurrency name  
 
+
+If you want to build a full payment URI for your clients, you can use our `build_payment_uri` tag, like so:
+
+```djangotemplate
+{% build_payment_uri btc 1PE5U4temq1rFzseHHGE2L8smwHCyRbkx3 0.001 %}
+
+# will output: bitcoin:1PE5U4temq1rFzseHHGE2L8smwHCyRbkx3?amount=0.001
+```
+
+It takes 3 arguments: the coin, the payment address and the value in the main denomination of the coin, and it will output a payment URI ready for you to feed into a QR Code generator
+
 ## Help
 
 Need help?  

cryptapi/forms.py

@@ -26,7 +26,7 @@ class CallbackForm(BaseCallbackForm):
 class AddressCreatedForm(forms.Form):
     address_in = forms.CharField(max_length=128)
     address_out = forms.CharField(max_length=128)
-    callback_url = forms.CharField(max_length=16384)
+    callback_url = forms.CharField(max_length=16383)
     status = forms.CharField(max_length=16)
 
     def __init__(self, initials, *args, **kwargs):

cryptapi/meta.py

@@ -1,4 +1,4 @@
 from distutils.version import StrictVersion
 
 
-VERSION = StrictVersion('0.1.4')
+VERSION = StrictVersion('0.1.5')

cryptapi/migrations/0001_initial.py

@@ -28,7 +28,7 @@ class Migration(migrations.Migration):
             name='PaymentLog',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('raw_data', models.CharField(max_length=16384)),
+                ('raw_data', models.CharField(max_length=16383)),
                 ('timestamp', models.DateTimeField(auto_now_add=True)),
                 ('payment', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='cryptapi.Payment')),
             ],
@@ -61,7 +61,7 @@ class Migration(migrations.Migration):
             name='RequestLog',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('raw_data', models.CharField(max_length=16384)),
+                ('raw_data', models.CharField(max_length=16383)),
                 ('timestamp', models.DateTimeField(auto_now_add=True)),
                 ('request', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='cryptapi.Request')),
             ],

cryptapi/models.py

@@ -47,7 +47,7 @@ def __str__(self):
 
 class RequestLog(models.Model):
     request = models.ForeignKey(Request, on_delete=models.SET_NULL, null=True)
-    raw_data = models.CharField(max_length=16384)
+    raw_data = models.CharField(max_length=16383)
     timestamp = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):
@@ -56,7 +56,7 @@ def __str__(self):
 
 class PaymentLog(models.Model):
     payment = models.ForeignKey(Payment, on_delete=models.SET_NULL, null=True)
-    raw_data = models.CharField(max_length=16384)
+    raw_data = models.CharField(max_length=16383)
     timestamp = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):

cryptapi/templatetags/cryptapi_helper.py

@@ -1,5 +1,6 @@
 from django import template
 from cryptapi.helpers import get_coin_multiplier
+from cryptapi.utils import build_query_string
 
 register = template.Library()
 
@@ -19,16 +20,48 @@ def convert_value(coin, value):
 @register.filter
 def coin_protocol(coin):
     coins = {
-        'btc': 'bitcoin',
-        'bch': 'bitcoincash',
-        'ltc': 'litecoin',
-        'eth': 'ethereum',
-        'iota': 'iota',
+        'btc': 'bitcoin:',
+        'bch': 'bitcoincash:',
+        'ltc': 'litecoin:',
+        'eth': 'ethereum:',
+        'xmr': 'monero:',
+        'iota': 'iota:',
     }
 
     return coins.get(coin, '')
 
 
+@register.simple_tag
+def build_payment_uri(coin, address, value):
+    protocol = coin_protocol(coin)
+    keys = {
+        'btc': 'amount',
+        'bch': 'amount',
+        'ltc': 'amount',
+        'eth': 'value',
+        'xmr': 'tx_amount',
+        'iota': 'amount'
+    }
+
+    if protocol:
+        uri = address
+
+        if not str(address).startswith('bitcoincash:'):
+            uri = protocol + address
+
+        c_value = value
+
+        if coin in ['eth', 'iota']:
+            multiplier = get_coin_multiplier(coin, default=None)
+
+            if multiplier:
+                c_value = int(value * multiplier)
+
+        data = {keys[coin]: c_value}
+
+        return "{uri}?{query}".format(uri=uri, query=build_query_string(data))
+
+
 @register.filter
 def coin_name(coin):
     coins = {

cryptapi/utils.py

@@ -1,6 +1,11 @@
 import requests
 from django.shortcuts import reverse
 from cryptapi.config import CRYPTAPI_URL
+from urllib.parse import urlencode
+
+
+def build_query_string(data):
+    return urlencode(data)
 
 
 def build_callback_url(_r, params):