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Re: libcurl and s3/minio
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From: R C via curl-library <curl-library_at_lists.haxx.se>
Date: Tue, 26 Mar 2024 14:17:10 -0600
On 3/26/24 12:01, Dan Fandrich via curl-library wrote:
> On Tue, Mar 26, 2024 at 11:36:07AM -0600, R C via curl-library wrote:
>> I am trying to find out how to write something, using libcurl, to do some io
>> with a minio object store (s3 compatible)
>>
>> I did go a bit through the examples page (some I have used as een example for
>> other projects), but could really find what I was looking for. I did find a
>> script that uses curl (the command) that seems to work
>>
>> this is a code fragment, for what I try to write into C.
> Do you know about the --libcurl option? It can write your code for you.
>
>> curl --insecure \
> --insecure is a bad idea, especially when you're sending credentials over the
> wire. You should fix your certificate store so that it's not needed.
>
>> -o "${OUT_FILE}" \
>>
>> -H "Host: $URL" \
> This is seldom needed because curl adds it on its own.
without it the script doesn't work with minio
>
>> -H "Date: ${DATE}" \
> Date: on a request? I've never seen that before. Is that needed by AWS
> signatures?
>
>> -H "Content-Type: ${CONTENT_TYPE}" \
> This one doesn't make much sense on a GET request, because there is no content
> being sent. Did you really want Accept:?
>
>> -H "Authorization: AWS ${USERNAME}:${SIGNATURE}" \
> curl versions since 7.75.0 have AWS signature calculation built-in, with the
> --aws-sigv4 option.
>
>> ${PROTOCOL}://$URL${MINIO_PATH}
>>
>> I saw an example called httpcustomheader, which came closest to what I'm
>> looking for I think.
> This is a very simple request with one custom header, so simple.c will do fine
> with the addition of CURLOPT_HTTPHEADER which you can see how to do in many
> other examples. But look at the curl's built-in AWS support first.
Date: Tue, 26 Mar 2024 14:17:10 -0600
On 3/26/24 12:01, Dan Fandrich via curl-library wrote:
> On Tue, Mar 26, 2024 at 11:36:07AM -0600, R C via curl-library wrote:
>> I am trying to find out how to write something, using libcurl, to do some io
>> with a minio object store (s3 compatible)
>>
>> I did go a bit through the examples page (some I have used as een example for
>> other projects), but could really find what I was looking for. I did find a
>> script that uses curl (the command) that seems to work
>>
>> this is a code fragment, for what I try to write into C.
> Do you know about the --libcurl option? It can write your code for you.
>
>> curl --insecure \
> --insecure is a bad idea, especially when you're sending credentials over the
> wire. You should fix your certificate store so that it's not needed.
>
>> -o "${OUT_FILE}" \
>>
>> -H "Host: $URL" \
> This is seldom needed because curl adds it on its own.
without it the script doesn't work with minio
>
>> -H "Date: ${DATE}" \
> Date: on a request? I've never seen that before. Is that needed by AWS
> signatures?
>
>> -H "Content-Type: ${CONTENT_TYPE}" \
> This one doesn't make much sense on a GET request, because there is no content
> being sent. Did you really want Accept:?
>
>> -H "Authorization: AWS ${USERNAME}:${SIGNATURE}" \
> curl versions since 7.75.0 have AWS signature calculation built-in, with the
> --aws-sigv4 option.
>
>> ${PROTOCOL}://$URL${MINIO_PATH}
>>
>> I saw an example called httpcustomheader, which came closest to what I'm
>> looking for I think.
> This is a very simple request with one custom header, so simple.c will do fine
> with the addition of CURLOPT_HTTPHEADER which you can see how to do in many
> other examples. But look at the curl's built-in AWS support first.
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