Django Template Filters to Add HTTPS and Highlight URLs

 # app/templatetags/app_filters.py
from urlextract import URLExtract
import requests
...
@register.filter(name='addhttpstodomains') # The first filter, to add HTTPS
def addhttpstodomains(value):
    domains = re.findall(r'', value) # Regex to get a URL
    dic = {}
    output = ""
    for domain in domains:
        if not domain[1].lower() in escaped_domains:
            url = 'https://' + domain[1]
            if not url.lower().startswith('uglek.com'):
                try:
                    response = requests.head('https://' + domain[1]) # Get the head
                    if response.status_code == 200: # If the page exists
                        dic[domain[1]] = 'https://' + domain[1] 
                except:
                    print("URL does not exist")
            else:
                dic[domain[1]] = 'https://' + domain[1]
    replaced_items = []
    for i, j in dic.items(): # Replace without replacing twice
        if not i in replaced_items:
            value = value.replace(i, j)
        replaced_items.append(i);
    value = str(value)
    while value.find('https://') > -1: # Remove any duplicates
        value = value.replace('https://','https://')
    return value

@register.filter(name='embedlinks')
def embedlinks(value):
    output = ""
    chunks = value.split("https://") # Split at HTTPS
    for x, chunk in enumerate(chunks): # Enumerate over split sections
        if x != 0:
            chunk = "https://" + chunk # Add HTTPS back in
        urls = extractor.find_urls(chunk); # Find URL in chunk
        dic = {}
        for url in urls:
            plus = ' (it\'s on Uglek)' # Configure anchor tag
            if not url[8:17].lower() == 'uglek.com':
                plus = ' (it will take you outside of Uglek)'
            if url.endswith('.') or url.endswith(','):
                url = url[:-1]
            if not url.lower().startswith('uglek.com') and url.lower().startswith('https://'):
                try:
                    response = requests.head(url) # Get the page
                    if response.status_code == 200: # If it exists
                        dic[url] = '' + url[8:] + '' # Build anchor tag to replace URL with
                except:
                    print("URL does not exist")
            elif url.startswith('https://'):
                dic[url] = '' + url[8:] + ''
        for i, j in dic.items(): # Find and replace in chunk
            chunk = chunk.replace(i, j)
        output = output + chunk # Put the pieces back together
    return output

{{ post.content|addhttpstodomains|embedlinks }} # Add HTTPS and embed links