Using Alexa RestAPI Voice Service with cURL
I would like to get the Alexa API ( https://developer.amazon.com/public/solutions/alexa/alexa-voice-service/rest/speechrecognizer-requests ) using curl. The voicerecogniser API call is more complex than I'm used to using and you need an MP3 file that includes a voice sample. Can anyone advise how the following would be structured with curl? (There is more information at this link)
POST /v1/avs/speechrecognizer/xxxxxxxxxxxx HTTP/1.1
Host: access-alexa-na.amazon.com
Authorization: Bearer xxxxxxxxxxxx
Content-Type: multipart/form-data; boundary=boundary_term
Transfer-Encoding: chunked
--boundary_term
Content-Disposition: form-data; name="request"
Content-Type: application/json; charset=UTF-8
{
"messageHeader": {
"deviceContext": [
{
"name": "playbackState",
"namespace": "AudioPlayer"
"payload": {
"streamId": "xxxxxxxxxxxx",
"offsetInMilliseconds": "xxxxxxxxxxxx",
"playerActivity": "xxxxxxxxxxxx"
}
},
{
...
},
...
]
},
"messageBody": {
"profile": "alexa-close-talk",
"locale": "en-us",
"format": "audio/L16; rate=16000; channels=1"
}
}
--boundary_term
Content-Disposition: form-data; name="audio"
Content-Type: audio/L16; rate=16000; channels=1
...encoded_audio_data...
--boundary_term--
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I'm not a bash expert, but this is how I was able to interact with AVS using cURL. I am creating a file that contains multi-page body content that includes binary audio data and passes it along with cURL.
############################################################
# First we creat a bunch of variables to hold data.
############################################################
# Auth token
TOKEN="Atza|IQEBLjAsAhR..."
# Boundary
BOUNDARY="BOUNDARY1234"
BOUNDARY_DASHES="--"
# Newline characters
NEWLINE='\r\n';
# Metadata headers
METADATA_CONTENT_DISPOSITION="Content-Disposition: form-data; name=\"metadata\"";
METADATA_CONTENT_TYPE="Content-Type: application/json; charset=UTF-8";
# Audio headers
AUDIO_CONTENT_TYPE="Content-Type: audio/L16; rate=16000; channels=1";
AUDIO_CONTENT_DISPOSITION="Content-Disposition: form-data; name=\"audio\"";
# Metadata JSON body
METADATA="{\
\"messageHeader\": {},\
\"messageBody\": {\
\"profile\": \"alexa-close-talk\",\
\"locale\": \"en-us\",\
\"format\": \"audio/L16; rate=16000; channels=1\"\
}\
}"
############################################################
# Then we start composing the body using the variables.
############################################################
# Compose the start of the request body
POST_DATA_START="
${BOUNDARY_DASHES}${BOUNDARY}${NEWLINE}${METADATA_CONTENT_DISPOSITION}${NEWLINE}\
${METADATA_CONTENT_TYPE}\
${NEWLINE}${NEWLINE}${METADATA}${NEWLINE}${NEWLINE}${BOUNDARY_DASHES}${BOUNDARY}${NEWLINE}\
${AUDIO_CONTENT_DISPOSITION}${NEWLINE}${AUDIO_CONTENT_TYPE}${NEWLINE}"
# Compose the end of the request body
POST_DATA_END="${NEWLINE}${NEWLINE}${BOUNDARY_DASHES}${BOUNDARY}${BOUNDARY_DASHES}${NEWLINE}"
# Now we create a request body file to hold everything including the binary audio data.
# Write metadata to body file
echo -e $POST_DATA_START > multipart_body.txt
# Append binary audio data to body file
cat hello.wav >> multipart_body.txt
# Append closing boundary to body file
echo -e $POST_DATA_END >> multipart_body.txt
############################################################
# Finally we get to compose the cURL request command
# passing it the generated request body file as the multipart body.
############################################################
# Compose cURL command and write to output file
curl -X POST \
-H "Authorization: Bearer ${TOKEN}"\
-H "Content-Type: multipart/form-data; boundary=${BOUNDARY}"\
--data-binary @foo.txt\
https://access-alexa-na.amazon.com/v1/avs/speechrecognizer/recognize\
> response.txt
Audio MUST - Mono channel sampled at 16 kHz and signed with 16-bit PCM. Otherwise AVS won't send anything.
For more information, check out the Alexa Voice Service (AVS) with a cURL blog post .
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