Web-LangTag/search.py

#!/usr/bin/env python3

# You can test it with:
# curl --request POST  --data string=foobar\&what=language http://localhost:4000

import urllib.parse

# PostgreSQL interface
import psycopg2

# HTML templates http://www.yattag.org/
from yattag import Doc
# TODO include the standard elements such as CSS and footer

REDIRECTION_URL = "https://www.langtag.net/registries/registry-html" # For
# local testing: Firefox apparently does not accept a redirect to a
# file.

def pack(start_response, status, title, body, headers = []):
    doc, tag, text = Doc().tagtext()
    doc.asis("<?xml version=\"1.0\" ?>\n")
    doc.asis("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">")
    with tag("html", ("xml:lang", "en"), lang = "en", xmlns = "http://www.w3.org/1999/xhtml"):
        with tag("head"):
            with tag("title"):
                text(title)
        with tag("body"):
            doc.asis(body.getvalue())
    data = doc.getvalue()
    datae = data.encode()
    response_headers = [("Content-type", "text/html; charset=UTF-8"), 
                        ("Content-Length", str(len(datae)))]
    if headers != []:
        for header in headers:
            response_headers.append(header)
    start_response(status, response_headers)
    return [datae]

def application(environ, start_response):
    if environ["REQUEST_METHOD"] != "POST":
        status = "405 Method unavailable"
        msg = "Unsupported HTTP method \"%s\"\r\n" % environ["REQUEST_METHOD"]
        doc, tag, text = Doc().tagtext()
        with tag("p"):
            text(msg)
        return pack(start_response, status, msg, doc)
    try:
        body_size = int(environ.get("CONTENT_LENGTH", 0))
    except (ValueError):
        body_size = 0
    body = environ["wsgi.input"].read(body_size)
    query = urllib.parse.parse_qsl(body.decode())
    form = {}
    headers = []
    for q in query:
        form[q[0]] = q[1]
    for mandatory in ["string", "what"]:
        if mandatory not in form:
            status = "400 Invalid request"
            msg = "Missing \"%s\" in request\r\n" % mandatory
            doc, tag, text = Doc().tagtext()
            with tag("p"):
                text(msg)
            return pack(start_response, status, msg, doc)
    if form["what"] == "language":
        sql = "SELECT code,suppressscript,preferredvalue,added,comments FROM Languages WHERE code = %s"
        term = form["string"].lower()
    elif form["what"] == "script":
        sql = "SELECT code,added,comments FROM Scripts WHERE code = %s"
        term = form["string"].capitalize()
    elif form["what"] == "region":
        sql = "SELECT code,added,comments FROM Regions WHERE code = %s"
        term = form["string"].upper()
    else:
        status = "400 Invalid request"
        msg = "Unknown search category \"%s\"\r\n" % form["what"]
        doc, tag, text = Doc().tagtext()
        with tag("p"):
            text(msg)
        return pack(start_response, status, msg, doc)
    cursor.execute(sql, (term, ))
    mytuple = cursor.fetchone()
    status = "200 OK"
    doc, tag, text = Doc().tagtext()
    title = "Result for %s" % term
    if mytuple is not None:
        status = "307 Redirect"
        url = "%s/%s/%s.html" % (REDIRECTION_URL, form["what"], mytuple[0])
        headers.append(("Location", url))
        msg = "Redirect to %s\r\n" % (url)
        with tag("p"):
            text("Redirect to ")
            with tag("a", href = url):
                text(url)
            text("\r\n")
    else:
        if form["what"] == "language":
            sql = "SELECT Languages.code, Descriptions.description FROM Languages,Descriptions_Languages,Descriptions WHERE Descriptions_Languages.description = Descriptions.id AND Descriptions_Languages.lang = Languages.code AND position(%s in lower(Descriptions.description)) > 0;" 
        elif form["what"] == "script":
            sql = "SELECT Scripts.code, Descriptions.description FROM Scripts,Descriptions_Scripts,Descriptions WHERE Descriptions_Scripts.description = Descriptions.id AND Descriptions_Scripts.script = Scripts.code AND position(%s in lower(Descriptions.description)) > 0;" 
        elif form["what"] == "region":
            sql = "SELECT Regions.code, Descriptions.description FROM Regions,Descriptions_Regions,Descriptions WHERE Descriptions_Regions.description = Descriptions.id AND Descriptions_Regions.region = Regions.code AND position(%s in lower(Descriptions.description)) > 0;" 
        cursor.execute(sql, (form["string"], ))
        found = False
        with tag("h1"):
            text("Results for %s" % form["string"])
        with tag("p"):
            with tag("ul"):
                for tuple in cursor.fetchall():
                    code = tuple[0]
                    description = tuple[1]
                    with tag("li"):
                        with tag("a", href = "%s/%s/%s.html" % (REDIRECTION_URL, form["what"], code)):
                            text("%s: %s\r\n" % (code, description))
                    found = True
                if not found:
                    with tag("li"):
                        text("\"%s\" not found\r\n" % term)
    return pack(start_response, status, title, doc, headers)

# Initialize
conn = psycopg2.connect("dbname=lsr")
cursor = conn.cursor()
First test of the future search engine 2023-06-12 09:11:18 +02:00			`#!/usr/bin/env python3`

			`# You can test it with:`
Smarter research 2023-06-12 21:45:53 +02:00			`# curl --request POST --data string=foobar\&what=language http://localhost:4000`
First test of the future search engine 2023-06-12 09:11:18 +02:00
			`import urllib.parse`

Smarter research 2023-06-12 21:45:53 +02:00			`# PostgreSQL interface`
First test of the future search engine 2023-06-12 09:11:18 +02:00			`import psycopg2`

Smarter research 2023-06-12 21:45:53 +02:00			`# HTML templates http://www.yattag.org/`
			`from yattag import Doc`
Syndication feed fixed 2023-08-03 16:40:18 +02:00			`# TODO include the standard elements such as CSS and footer`
Smarter research 2023-06-12 21:45:53 +02:00
Search engine almost done 2023-08-02 14:47:24 +02:00			`REDIRECTION_URL = "https://www.langtag.net/registries/registry-html" # For`
			`# local testing: Firefox apparently does not accept a redirect to a`
			`# file.`
First test of the future search engine 2023-06-12 09:11:18 +02:00
Search engine almost done 2023-08-02 14:47:24 +02:00			`def pack(start_response, status, title, body, headers = []):`
			`doc, tag, text = Doc().tagtext()`
			`doc.asis("<?xml version=\"1.0\" ?>\n")`
			`doc.asis("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">")`
			`with tag("html", ("xml:lang", "en"), lang = "en", xmlns = "http://www.w3.org/1999/xhtml"):`
			`with tag("head"):`
			`with tag("title"):`
			`text(title)`
			`with tag("body"):`
			`doc.asis(body.getvalue())`
			`data = doc.getvalue()`
			`datae = data.encode()`
			`response_headers = [("Content-type", "text/html; charset=UTF-8"),`
First test of the future search engine 2023-06-12 09:11:18 +02:00			`("Content-Length", str(len(datae)))]`
* List of HTML files * Improved search script 2023-08-01 20:58:15 +02:00			`if headers != []:`
			`for header in headers:`
			`response_headers.append(header)`
First test of the future search engine 2023-06-12 09:11:18 +02:00			`start_response(status, response_headers)`
			`return [datae]`

			`def application(environ, start_response):`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`if environ["REQUEST_METHOD"] != "POST":`
			`status = "405 Method unavailable"`
Search engine almost done 2023-08-02 14:47:24 +02:00			`msg = "Unsupported HTTP method \"%s\"\r\n" % environ["REQUEST_METHOD"]`
			`doc, tag, text = Doc().tagtext()`
			`with tag("p"):`
			`text(msg)`
			`return pack(start_response, status, msg, doc)`
First test of the future search engine 2023-06-12 09:11:18 +02:00			`try:`
			`body_size = int(environ.get("CONTENT_LENGTH", 0))`
			`except (ValueError):`
			`body_size = 0`
			`body = environ["wsgi.input"].read(body_size)`
			`query = urllib.parse.parse_qsl(body.decode())`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`form = {}`
* List of HTML files * Improved search script 2023-08-01 20:58:15 +02:00			`headers = []`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`for q in query:`
			`form[q[0]] = q[1]`
			`for mandatory in ["string", "what"]:`
			`if mandatory not in form:`
			`status = "400 Invalid request"`
Search engine almost done 2023-08-02 14:47:24 +02:00			`msg = "Missing \"%s\" in request\r\n" % mandatory`
			`doc, tag, text = Doc().tagtext()`
			`with tag("p"):`
			`text(msg)`
			`return pack(start_response, status, msg, doc)`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`if form["what"] == "language":`
Search engine almost done 2023-08-02 14:47:24 +02:00			`sql = "SELECT code,suppressscript,preferredvalue,added,comments FROM Languages WHERE code = %s"`
Smarter research 2023-06-12 21:45:53 +02:00			`term = form["string"].lower()`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`elif form["what"] == "script":`
Search engine almost done 2023-08-02 14:47:24 +02:00			`sql = "SELECT code,added,comments FROM Scripts WHERE code = %s"`
Smarter research 2023-06-12 21:45:53 +02:00			`term = form["string"].capitalize()`
Search of region 2023-08-02 17:52:44 +02:00			`elif form["what"] == "region":`
			`sql = "SELECT code,added,comments FROM Regions WHERE code = %s"`
			`term = form["string"].upper()`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`else:`
			`status = "400 Invalid request"`
Search engine almost done 2023-08-02 14:47:24 +02:00			`msg = "Unknown search category \"%s\"\r\n" % form["what"]`
			`doc, tag, text = Doc().tagtext()`
			`with tag("p"):`
			`text(msg)`
			`return pack(start_response, status, msg, doc)`
Smarter research 2023-06-12 21:45:53 +02:00			`cursor.execute(sql, (term, ))`
Search engine a bit better 2023-06-12 18:34:27 +02:00			`mytuple = cursor.fetchone()`
			`status = "200 OK"`
Search engine almost done 2023-08-02 14:47:24 +02:00			`doc, tag, text = Doc().tagtext()`
			`title = "Result for %s" % term`
* List of HTML files * Improved search script 2023-08-01 20:58:15 +02:00			`if mytuple is not None:`
an change the HTTP method when redirecting 2023-08-02 18:43:06 +02:00			`status = "307 Redirect"`
Search engine almost done 2023-08-02 14:47:24 +02:00			`url = "%s/%s/%s.html" % (REDIRECTION_URL, form["what"], mytuple[0])`
* List of HTML files * Improved search script 2023-08-01 20:58:15 +02:00			`headers.append(("Location", url))`
Search engine almost done 2023-08-02 14:47:24 +02:00			`msg = "Redirect to %s\r\n" % (url)`
			`with tag("p"):`
			`text("Redirect to ")`
			`with tag("a", href = url):`
			`text(url)`
			`text("\r\n")`
Smarter research 2023-06-12 21:45:53 +02:00			`else:`
			`if form["what"] == "language":`
Search engine almost done 2023-08-02 14:47:24 +02:00			`sql = "SELECT Languages.code, Descriptions.description FROM Languages,Descriptions_Languages,Descriptions WHERE Descriptions_Languages.description = Descriptions.id AND Descriptions_Languages.lang = Languages.code AND position(%s in lower(Descriptions.description)) > 0;"`
Smarter research 2023-06-12 21:45:53 +02:00			`elif form["what"] == "script":`
Search engine almost done 2023-08-02 14:47:24 +02:00			`sql = "SELECT Scripts.code, Descriptions.description FROM Scripts,Descriptions_Scripts,Descriptions WHERE Descriptions_Scripts.description = Descriptions.id AND Descriptions_Scripts.script = Scripts.code AND position(%s in lower(Descriptions.description)) > 0;"`
Search of region 2023-08-02 17:52:44 +02:00			`elif form["what"] == "region":`
			`sql = "SELECT Regions.code, Descriptions.description FROM Regions,Descriptions_Regions,Descriptions WHERE Descriptions_Regions.description = Descriptions.id AND Descriptions_Regions.region = Regions.code AND position(%s in lower(Descriptions.description)) > 0;"`
Search engine almost done 2023-08-02 14:47:24 +02:00			`cursor.execute(sql, (form["string"], ))`
Smarter research 2023-06-12 21:45:53 +02:00			`found = False`
Search engine almost done 2023-08-02 14:47:24 +02:00			`with tag("h1"):`
			`text("Results for %s" % form["string"])`
			`with tag("p"):`
			`with tag("ul"):`
			`for tuple in cursor.fetchall():`
			`code = tuple[0]`
			`description = tuple[1]`
			`with tag("li"):`
			`with tag("a", href = "%s/%s/%s.html" % (REDIRECTION_URL, form["what"], code)):`
			`text("%s: %s\r\n" % (code, description))`
			`found = True`
			`if not found:`
			`with tag("li"):`
			`text("\"%s\" not found\r\n" % term)`
			`return pack(start_response, status, title, doc, headers)`
First test of the future search engine 2023-06-12 09:11:18 +02:00
Production search engine 2023-08-02 18:27:04 +02:00			`# Initialize`
			`conn = psycopg2.connect("dbname=lsr")`
			`cursor = conn.cursor()`