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Send an SMS from a Twilio sim via Programmable SMS

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Send an SMS from a Twilio sim via Programmable SMS to the outside world.

Enter this as TwiML in the SMS section of the ‘Progammable Voice and SMS’ in the settings menu for your sim.

<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <!-- The from tag contains the phone number assigned to the sim -->
    <Message from="+19195551212" to="{{To}}">
     {{Body}} 
   </Message> 
</Response>

Written by M Kapoor

December 23, 2019 at 8:21 pm

Posted in Programming

Tagged with , , ,

Authenticate with BackBlaze B2 and list buckets with Python

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Authenticate with BackBlaze B2 and list buckets with Python.

First to authenticate with BackBlaze B2:


import requests
from requests.auth import HTTPBasicAuth

#Credentials from BackBlaze B2 manager
key_id          = 'b2_key_id'
application_key = 'b2_application_key'

#Contact authorization server and check response
path   = 'https://api.backblazeb2.com/b2api/v1/b2_authorize_account'
result = requests.get(path, auth=HTTPBasicAuth(key_id, application_key))
if result.status_code != 200:
    print 'Error - Could not connect to BackBlaze B2'
    exit()

#Get results and add authorization token to headers
result_json = result.json()
account_id  = result_json['accountId']
auth_token  = result_json['authorizationToken']
api_url     = result_json['apiUrl'] + '/b2api/v1'
api_session = requests.Session()
api_session.headers.update({ 'Authorization': auth_token })

Now use api_session to interact with B2. For example, download the list of buckets like this:


#Construct the API url
url = api_url + '/b2_list_buckets'

#Use the api_session parameter to get a list of buckets
bucketInfo = api_session.post(url, json={'accountId': account_id})

#Convert datastream to json
jsonBucketInfo = bucketInfo.json()

#List id and name
for bucket in jsonBucketInfo['buckets']:
    bucketId = bucket['bucketId']
    bucketName = bucket['bucketName']

    print bucketId, bucketName

More details about tokens in the json are on BackBlaze’s list_buckets API page.

Written by M Kapoor

December 23, 2019 at 8:05 pm

Posted in Programming

Tagged with ,

Authenticate with BackBlaze B2 and get file URLs using Python

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Authenticate with BackBlaze B2 and get the URLs of files in a bucket.

First to authenticate with BackBlaze B2:


import requests
from requests.auth import HTTPBasicAuth

#Auth information from Backblaze
key_id = 'key_id'
application_key = 'application_key'

#Authenticate
path = 'https://api.backblazeb2.com/b2api/v1/b2_authorize_account'
result = requests.get(path, auth=HTTPBasicAuth(key_id, application_key))
if result.status_code != 200:
    print 'Error - Could not connect to BackBlaze B2'
    exit()

#Read response
result_json = result.json()
account_id = result_json['accountId']
auth_token = result_json['authorizationToken']
api_url    = result_json['apiUrl'] + '/b2api/v1'
download_url = result_json['downloadUrl'] + '/file/'
api_session = requests.Session()
api_session.headers.update({ 'Authorization': auth_token })

Now get bucket contents and assemble URL. Sample code for bucket ID and bucket name is here.


#Initialize
bucketId = 'bucket_id_from_b2'
bucketName = 'name_of_bucket'

params = {'bucketId': bucketId}
urls = set()

#Loop for as long as a nextFile exists
while True:
    #Construct api call, execute, and read back information
    url = api_url + '/' + 'b2_list_file_names'
    fileList =  api_session.post(url, json=params)
    jFileList = fileList.json()

    #Loop through files and construct url
    for file in jFileList['files']:
        urls.add(download_url + bucketName + '/' + file['filename'])

    #Check for next file and break if it doesn't exist
    startFileName = jFileList['nextFileName']
    if startFileName == None:
        break
    else:
        #continue If next file exists
        params['startFileName'] = startFileName
        

Written by M Kapoor

December 23, 2019 at 7:17 pm

Posted in Programming

Tagged with ,

Forward SMS to multiple phone numbers with TwiML Bin

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Other parameters are possible like {{FromCity}} and {{FromState}}.  You can forward to multiple numbers by duplicating the Message tag.

More details here:
https://www.twilio.com/docs/sms/twiml

<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Message to="+16623458765">Twilio: {{From}}: {{Body}}</Message>
    <Message to="+15033943032">Twilio: {{From}}: {{Body}}</Message>
</Response>

Written by M Kapoor

September 19, 2018 at 12:44 pm

Posted in twilio

Tagged with ,

Generate and save a static page in Django

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Generate and save a static page in Django.

Where
html/static.html is a Django template
data is the data you want to pass into the page
static(request) is a function mapped to a url in urls.py

Then
Visiting the page will generate this static file

Code

from django.template.loader import render_to_string

def static(request):
    results = render_to_string('html/static.html', {'content': html})
    with open(r'C:tempstatic.html','w') as f:
        f.write(results)

Written by M Kapoor

August 23, 2018 at 4:56 am

Copy a file from a URL directly to S3 using boto3 and requests

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Copy a file at inUrl directly to a s3 bucket bucketName. ACL is set to public-read and ContentType is maintained from the from URL.

Your AWS credentials must be pre-set.

import boto3
import requests

#Set up boto3 env vars
os.environ['AWS_ACCESS_KEY_ID'] = ''
os.environ['AWS_SECRET_ACCESS_KEY'] = ''
os.environ['AWS_DEFAULT_REGION'] = 'us-west-2'


inUrl = r'file_to_read'
response = requests.get(inUrl)

s3 = boto3.resource('s3')
s3.Bucket(bucketName).put_object(Key='test/file_path.ext', Body=response.content, ACL='public-read',ContentType=response.headers['Content-Type'])

Written by M Kapoor

February 7, 2017 at 2:09 pm

Posted in python

Tagged with ,

Wait a random delay in Python

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Wait a random interval in seconds between 0 and delay.

import random
import time

timeDelay = random.randrange(0, delay)
time.sleep(timeDelay)

Written by M Kapoor

February 4, 2017 at 1:33 am

Posted in python

Tagged with , ,

Set User-Agent for Python requests library

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Some sites don’t allow page access if the User-Agent isn’t set. headers is a hash and can hold additional header tokens.

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'}
resp = requests.get(url, headers=headers)

Written by M Kapoor

February 4, 2017 at 1:29 am

Posted in python

Tagged with , ,

Download and save file using Python Requests

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Download and save a file using the Python requests library.

Where:
url = URL to download
filename = Name of local file for url

import requests

url = ''

response = requests.get(url)
with open(filename, 'wb') as f:
    f.write(response.content)

Written by M Kapoor

February 2, 2017 at 4:46 pm

Posted in python

Tagged with ,

Setting up a golang website to autorun on Ubuntu using systemd

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Here is how to set up a website to auto-launch and restart on failure on Ubuntu using systemd. I’m using a simple site written in Go and compiled into an executable called gosite – I got sample Go code from Jeffrey Bolle’s page.

Simple golang website code

package main

import(
    "net/http"
    "log"
    "os"
)

const resp = `Simple Web App
Hello World!`

func handler(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte(resp))
}

func main() {
    http.HandleFunc("/", handler)
    err := http.ListenAndServe(":8080", nil)

    if err != nil {
        log.Println(err)
        os.Exit(1)
    }
}

Setting up systemd

Once the code is ready and tested, lets move on to setting up systemd.

Create and open a file in the /lib/systemd/system folder:

 vim /lib/systemd/system/gosite.service

Edit the file with your parameters to match the contents below:

[Unit]
Description=A simple go website
ConditionPathExists=/home/user/bin/gosite

[Service]
Restart=always
RestartSec=3
ExecStart=/home/user/bin/gosite

[Install]
WantedBy=multi-user.target

Enable the service using systemctl:

root@hostname:/home/user# systemctl enable gosite.service
Created symlink from /etc/systemd/system/multi-user.target.wants/gosite.service to /lib/systemd/system/gosite.service.

Start the service:

service gosite start

Observe the service is running:

root@hostname:/home/user# ps aux | grep gosite
root 27413 0.0 0.2 827776 5012 ? Ssl 15:50 0:00 /home/user/bin/gosite

Written by M Kapoor

June 14, 2016 at 4:49 pm

Posted in Programming

Tagged with , , ,