Added support for HTTP TPC

[dynamic-entropy]

Added support for HTTP Third Party Copy to the ocdav package.
HTTP-TPC is a protocol, based on HTTP, for copying an entity located on one server to a different server.
The main benefit is to allow for optimal the network use.
One typical optimisation is achieved by allowing the two servers to communicate directly so that the data representing the
entity is not relayed through the controlling client.

TODO:

• [ ] Add ability to supply storage issued token -> this is addressed by mapping OIDC tokens

Closes #1787

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[lgtm-com]

This pull request introduces 2 alerts when merging 79bd34b into d3a946e - view on LGTM.com

new alerts:

• 2 for Uncontrolled data used in network request

[lgtm-com]

This pull request introduces 2 alerts when merging 0426fb9 into d3a946e - view on LGTM.com

new alerts:

• 2 for Uncontrolled data used in network request

[lgtm-com]

This pull request introduces 2 alerts when merging 56b2105 into d3a946e - view on LGTM.com

new alerts:

• 2 for Uncontrolled data used in network request

[lgtm-com]

This pull request introduces 2 alerts when merging 45c0cdc into d3a946e - view on LGTM.com

new alerts:

• 2 for Uncontrolled data used in network request

[lgtm-com]

This pull request introduces 2 alerts when merging dd0093b into d3a946e - view on LGTM.com

new alerts:

• 2 for Uncontrolled data used in network request

[lgtm-com]

This pull request introduces 2 alerts when merging 6024913 into 7f7fab2 - view on LGTM.com

new alerts:

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[lgtm-com]

This pull request introduces 2 alerts when merging 028a0cd into 7f7fab2 - view on LGTM.com

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[butonic]

for reference:
davix / docs

Davix aims to make the task of managing files over HTTP-based protocols simple. It is being developed by the IT-SDC-ID section at CERN, and while the project’s purpose is its use on the CERN grid, the functionality offered is generic.

gfal2 / docs

GFAL2 offers an a single and simple toolkit for the file operations in grids and cloud environments. The set of supported protocols depends on the installed plugins.

Just trying to understand what this is for...

[glpatcern]

Just trying to understand what this is for...

Indeed, thanks for adding those references @butonic ! And for completeness, this is the report of the GSoC project related to this PR:

https://gist.github.com/dynamic-entropy/ce664532ab28f8a13b7cf8f68e2d0f2a

[glpatcern]

Resurrecting this work to converge, so this PR could be merged and then we concentrate on the authentication part in another PR: can you please address those changes?

Then the authentication would touch the identity provider (in particular the oidc one), not this part, which I expect it to just work when Reva is driving the Third-Party Copy. Instead when Reva is the passive side, we'll have to possibly extend the code such that on GET we validate the bearer token against different/multiple IDPs.

[lgtm-com]

This pull request introduces 2 alerts when merging 3450ac2 into 96c9c09 - view on LGTM.com

new alerts:

• 2 for Uncontrolled data used in network request