how to send image to an API in micropython language - image

Question

I am trying to send image through API in Micropython. still no solution how to do it. please help
import urequests
import json
URL = 'https://example.com/test'
datas = json.dumps({"auth_key": "43435", "mac": "abcd", "name": "washid"})
filep = 'OBJ.jpg'
filess = {'odimg': open(filep, 'rb')}
try:
response = urequests.post(URL,data=datas,files=files)
print(response.json())
except Exception as e:
print(e)

Answer 1

Maybe this template can help you :
import ubinascii
import uos
import urequests
def make_request(data, image=None):
boundary = ubinascii.hexlify(uos.urandom(16)).decode('ascii')
def encode_field(field_name):
return (
b'--%s' % boundary,
b'Content-Disposition: form-data; name="%s"' % field_name,
b'',
b'%s'% data[field_name]
)
def encode_file(field_name):
filename = 'latest.jpeg'
return (
b'--%s' % boundary,
b'Content-Disposition: form-data; name="%s"; filename="%s"' % (
field_name, filename),
b'',
image
)
lines = []
for name in data:
lines.extend(encode_field(name))
if image:
lines.extend(encode_file('file'))
lines.extend((b'--%s--' % boundary, b''))
body = b'\r\n'.join(lines)
headers = {
'content-type': 'multipart/form-data; boundary=' + boundary,
'content-length': str(len(body))}
return body, headers
def upload_image(url, headers, data):
http_response = urequests.post(
url,
headers=headers,
data=data
)
if http_response.status_code == 204:
print('Uploaded request')
else:
raise UploadError(http_response)
http_response.close()
return http_response
You need to declare an header for your request

Answer 2

I used Jonathan's answer. Had to modify the code a bit (-thanks to Akshay to figure this out). A fixed boundary is used instead of generating a new one every time. Also, there needs to be an additional \r\n at the end of the file. I have used this to upload photos to Telegram Bot using ESP-32 CAM.
def make_request(data, image=None):
boundary = '---011000010111000001101001'
#boundary fixed instead of generating new one everytime
def encode_field(field_name): # prepares lines that include chat_id
return (
b'--%s' % boundary,
b'Content-Disposition: form-data; name="%s"' % field_name,
b'',
b'%s'% data[field_name] #field_name conatains chat_id
)
def encode_file(field_name): # prepares lines for the file
filename = 'latest.jpg' # dummy name is assigned to uploaded file
return (
b'--%s' % boundary,
b'Content-Disposition: form-data; name="%s"; filename="%s"' % (
field_name, filename),
b'',
image
)
lines = [] # empty array initiated
for name in data:
lines.extend(encode_field(name)) # adding lines (data)
if image:
lines.extend(encode_file('photo')) # adding lines image
lines.extend((b'--%s--' % boundary, b'')) # ending with boundary
body = b'\r\n'.join(lines) # joining all lines constitues body
body = body + b'\r\n' # extra addtion at the end of file
headers = {
'content-type': 'multipart/form-data; boundary=' + boundary
} # removed content length parameter
return body, headers # body contains the assembled upload package
def upload_image(url, headers, data):
http_response = urequests.post(
url,
headers=headers,
data=data
)
print(http_response.status_code) # response status code is the output for request made
if (http_response.status_code == 204 or http_response.status_code == 200):
print('Uploaded request')
else:
print('cant upload')
#raise UploadError(http_response) line commneted out
http_response.close()
return http_response
# funtion below is used to set up the file / photo to upload
def send_my_photo(photo_pathstring): # path and filename combined
token = 'authentication token or other data' # this my bot token
chat_id= 999999999 # my chat_id
url = 'https://api.telegram.org/bot' + token
path = photo_pathstring # this is the local path
myphoto = open(path , 'rb') #myphoto is the photo to send
myphoto_data = myphoto.read() # generate file in bytes
data = { 'chat_id' : 999999999 }
body, headers = make_request(data, myphoto_data) # generate body to upload
url = url + '/sendPhoto'
headers = { 'content-type': "multipart/form-data; boundary=---011000010111000001101001" }
upload_image(url, headers, body) # using function to upload to telegram