Replace email template Variables

The template variable replacement technique is often used when sending mail in batches, that is, a mail template with built-in variable identifier, and then a series of replicas Based on the recipient to generate the corresponding new mail. When the mail template format is fixed (mainly encoding, mail body format), it is easy to implement. Then, it is complicated to allow users to upload mail templates. The Code is as follows:

Import sys, OS, email, base64, email. header, quopri, reclass MailTpl (object): def _ init _ (self, mail_str): self. mail = mail_str self. mail_str = self. mail self. codetype = "UTF-8" self. analyze () def start (self): self. mail_str = self. mail def getmail (self): return self. mail_str def analyze (self): msg = email. message_from_string (self. mail_str) # parse the header self. mailfrom = msg. get ("from") self. mailto = msg. get ("to") self. subj = msg. get ("subject") self. msgid = msg. get ("message-id") # decode self from the header. mailfrom_x = email. header. decode_header (self. mailfrom) self. mailto_x = email. header. decode_header (self. mailto) self. subj_x = email. header. decode_header (self. subj) # parse the body (get the body text) self. text = [] for part in msg. walk (): if part. is_multipart (): continue content_type = part. get_content_type () if "text" in content_type: content_type_all = part ["content-type"] codetype = None if content_type_all: if "charset" in content_type_all: codetype = re. findall (r "charset = (. +) \ B ", content_type_all) [0] self. text. append (part. get_payload (), part ["Content-Transfer-Encoding"], codetype) # decode self. text_x = [] for txt in self. text: content, encoding, codetype = txt content_x = content if encoding = "base64": content_x = base64.decodestring (content) elif encoding = "quoted-printable ": content_x = quopri. decodestring (content) self. text_x.append (content_x, encoding, codetype) def newmsgid (self, msgid): self. mail_str = self. mail_str.replace ("d:" + self. msgid, "d:" + msgid) self. mail_str = self. mail_str.replace ("D:" + self. msgid, "D:" + msgid) def newfrom (self, name, addr): name_codetype = self. mailfrom_x [0] [1] new_name = str (email. header. make_header ([(name, self. codetype)]) new_addr = "<" + addr + ">" new_from = "% s" % (new_name, new_addr) self. mail_str = self. mail_str.replace ("m:" + self. mailfrom, "m:" + new_from) self. mail_str = self. mail_str.replace ("M:" + self. mailfrom, "M:" + new_from) def newto (self, name, addr): name_codetype = self. mailto_x [0] [1] new_name = str (email. header. make_header ([(name, self. codetype)]) new_addr = "<" + addr + ">" new_to = "% s" % (new_name, new_addr) self. mail_str = self. mail_str.replace ("o:" + self. mailto, "o:" + new_to) self. mail_str = self. mail_str.replace ("O:" + self. mailto, "O:" + new_to) def newsubj (self, params): new_subj_arr = [] for s in self. subj_x: content, codetype = s if codetype: content = content. decode (codetype) for p in params: k, v = p content = content. replace (k, v) new_subj_arr.append (content, codetype) new_subj = [] for s in new_subj_arr: content, codetype = s new_subj.append (str (email. header. make_header ([(content, self. codetype)]) new_subj = "". join (new_subj) self. mail_str = self. mail_str.replace ("t:" + self. subj, "t:" + new_subj) self. mail_str = self. mail_str.replace ("T:" + self. subj, "T:" + new_subj) def newbody (self, params): for I, t in enumerate (self. text_x): old_t = self. text [I] content, codetype, codetype = t for p in params: k, v = p content = content. replace (k, v) if codetype: content = content. encode (codetype) if codetype = "base64": content = base64.encodestring (content) elif codetype = "quoted-printable": content = quopri. encodestring (content) self. mail_str = self. mail_str.replace (old_t [0], content)

Knowledge points used:

1. parse the email by email. message_from_string. This method gets the key-value pairs of each email domain.

2. decodes the obtained domain values by email. header. emailHeader to get an array. each item is a tuples. the first item of the tuples is the decoded value, and the second item is encoded.

3. decode the mail body. Here there are two codes: content-type and charset)

4. The two strings in python27 must be converted to the same encoding before interoperation.