feat: Support for AMP HTML Email (#945)

sendgrid/helpers/mail/__init__.py

@@ -27,6 +27,7 @@
 from .groups_to_display import GroupsToDisplay
 from .header import Header
 from .html_content import HtmlContent
+from .amp_html_content import AmpHtmlContent
 from .ip_pool_name import IpPoolName
 from .mail_settings import MailSettings
 from .mail import Mail

sendgrid/helpers/mail/amp_html_content.py

@@ -0,0 +1,59 @@
+from .content import Content
+from .validators import ValidateApiKey
+
+
+class AmpHtmlContent(Content):
+    """AMP HTML content to be included in your email."""
+
+    def __init__(self, content):
+        """Create an AMP HTML Content with the specified MIME type and content.
+
+        :param content: The AMP HTML content.
+        :type content: string
+        """
+        self._content = None
+        self._validator = ValidateApiKey()
+
+        if content is not None:
+            self.content = content
+
+    @property
+    def mime_type(self):
+        """The MIME type for AMP HTML content.
+
+        :rtype: string
+        """
+        return "text/x-amp-html"
+
+    @property
+    def content(self):
+        """The actual AMP HTML content.
+
+        :rtype: string
+        """
+        return self._content
+
+    @content.setter
+    def content(self, value):
+        """The actual AMP HTML content.
+
+        :param value: The actual AMP HTML content.
+        :type value: string
+        """
+        self._validator.validate_message_dict(value)
+        self._content = value
+
+    def get(self):
+        """
+        Get a JSON-ready representation of this AmpContent.
+
+        :returns: This AmpContent, ready for use in a request body.
+        :rtype: dict
+        """
+        content = {}
+        if self.mime_type is not None:
+            content["type"] = self.mime_type
+
+        if self.content is not None:
+            content["value"] = self.content
+        return content

sendgrid/helpers/mail/content.py

@@ -29,7 +29,7 @@ def __init__(self, mime_type, content):
     @property
     def mime_type(self):
         """The MIME type of the content you are including in your email.
-        For example, "text/plain" or "text/html".
+        For example, "text/plain" or "text/html" or "text/x-amp-html".
 
         :rtype: string
         """
@@ -38,11 +38,11 @@ def mime_type(self):
     @mime_type.setter
     def mime_type(self, value):
         """The MIME type of the content you are including in your email.
-        For example, "text/plain" or "text/html".
+        For example, "text/plain" or "text/html" or "text/x-amp-html".
 
         :param value: The MIME type of the content you are including in your
                       email.
-        For example, "text/plain" or "text/html".
+        For example, "text/plain" or "text/html" or "text/x-amp-html".
         :type value: string
         """
         self._mime_type = value

sendgrid/helpers/mail/mail.py

@@ -27,6 +27,7 @@ def __init__(
             subject=None,
             plain_text_content=None,
             html_content=None,
+            amp_html_content=None,
             global_substitutions=None,
             is_multiple=False):
         """
@@ -43,6 +44,8 @@ def __init__(
         :type plain_text_content: string, optional
         :param html_content: The html body of the email
         :type html_content: string, optional
+        :param amp_html_content: The amp-html body of the email
+        :type amp_html_content: string, optional
         """
         self._attachments = None
         self._categories = None
@@ -71,6 +74,8 @@ def __init__(
             self.subject = subject
         if plain_text_content is not None:
             self.add_content(plain_text_content, MimeType.text)
+        if amp_html_content is not None:
+            self.add_content(amp_html_content, MimeType.amp)
         if html_content is not None:
             self.add_content(html_content, MimeType.html)
 
@@ -725,9 +730,23 @@ def add_content(self, content, mime_type=None):
         """
         if isinstance(content, str):
             content = Content(mime_type, content)
-        # Content of mime type text/plain must always come first
-        if content.mime_type == "text/plain":
+        # Content of mime type text/plain must always come first, followed by text/x-amp-html and then text/html
+        if content.mime_type == MimeType.text:
             self._contents = self._ensure_insert(content, self._contents)
+        elif content.mime_type == MimeType.amp:
+            if self._contents:
+                for _content in self._contents:
+                    # this is written in the context that plain text content will always come earlier than the html content
+                    if _content.mime_type == MimeType.text:
+                        index = 1
+                        break
+                    elif _content.mime_type == MimeType.html:
+                        index = 0
+                        break
+            else:
+                index = 0
+            self._contents = self._ensure_append(
+                content, self._contents, index=index)
         else:
             if self._contents:
                 index = len(self._contents)

sendgrid/helpers/mail/mime_type.py

@@ -3,3 +3,4 @@ class MimeType(object):
     """
     text = "text/plain"
     html = "text/html"
+    amp = "text/x-amp-html"