Sharable content item links with use restrictions

1. A method for sharing a server-stored content item, comprising:

receiving, from a client computing device used by an authenticated link submitter, a first request to access a server-stored content item at a sharable link;

wherein the link submitter is authenticated according to a first authentication factor;

determining, based on a first use restriction of a plurality of use restrictions specific to the sharable link, that a second authentication factor specific to the sharable link is required from the link submitter to access the server-stored content item at the sharable link;

determining, based on a second use restriction of the plurality of use restrictions specific to the sharable link, that the link submitter is required to belong to a set of one or more users specified as part of the second use restriction in order to access the server-stored content item at the sharable link;

responsive to receiving the first request, verifying the link submitter is one of the set of one or more users specified as part of the second use restriction specific to the sharable link; and prompting the link submitter to enter/submit the second authentication factor; and

allowing access to the server-stored content item at the sharable link by the link submitter if the link submitter is one of the set of one or more users specified as part of the second use restriction specific to the sharable link and responsive to receiving the second authentication factor from the link submitter;

wherein the method is performed by one or more computing devices.

2. The method of claim 1 , wherein the first authentication factor is a password provided by the link submitter.

3. The method of claim 1 , wherein the second authentication factor is a password or pin code provided by the link submitter.

4. The method of claim 1 , wherein the second authentication factor is a fingerprint, an eye print, or other biometric information detected from the link submitter.

5. The method of claim 1 , wherein the sharable link is in the form of a Uniform Resource Locator (URL).

6. The method of claim 1 , wherein the server-stored content item is one of a file or a folder.

7. The method of claim 1 , wherein the access requested by the link submitter is to download the server-stored content item to the client computing device of the link submitter.

8. The method of claim 1 , wherein the access requested by the link submitter is to view the server-stored content item at the client computing device of the link submitter.

9. The method of claim 1 , wherein the access requested by the link submitter is to view a preview of the server-stored content item at the client computing device of the link submitter.

10. The method of claim 1 , further comprising:

prompting the link submitter to enter/submit the second authentication factor based on a use restriction specific to the sharable link.

11. A system comprising:

one or more computing devices configured with instructions which, when executed by the one or more computing devices, cause:

receiving, from a client computing device used by an authenticated link submitter, a first request to access a server-stored content item at a sharable link;

wherein the link submitter is authenticated according to a first authentication factor;

determining, based on a first use restriction of use restrictions specific to the sharable link, that a second authentication factor specific to the sharable link is required from the link submitter to access the server-stored content item at the sharable link;

determining, based on a second use restriction of the plurality of use restrictions specific to the sharable link, that the link submitter is required to belong to a set of one or more users specified as part of the second use restriction in order to access the server-stored content item at the sharable link;

responsive to receiving the first request, verifying the link submitter is one of the set of one or more users specified as part of the second use restriction specific to the sharable link; and prompting the link submitter to enter/submit the second authentication factor; and

allowing access to the server-stored content item at the sharable link by the link submitter if the link submitter is one of the set of one or more users specified as part of the second use restriction specific to the sharable link and responsive to receiving the second authentication factor from the link submitter.

12. The system of claim 11 , wherein the first authentication factor is a password provided by the link submitter.

13. The system of claim 11 , wherein the second authentication factor is a password or pin code provided by the link submitter.

14. The system of claim 11 , wherein the second authentication factor is a fingerprint, an eye print, or other biometric information detected from the link submitter.

15. The system of claim 11 , wherein the sharable link is in the form of a Uniform Resource Locator (URL).

16. The system of claim 11 , wherein the server-stored content item is one of a file or a folder.

17. The system of claim 11 , wherein the access requested by the link submitter is to download the server-stored content item to the client computing device of the link submitter.

18. The system of claim 11 , wherein the access requested by the link submitter is to view the server-stored content item at the client computing device of the link submitter.

19. The system of claim 11 , wherein the access requested by the link submitter is to view a preview of the server-stored content item at the client computing device of the link submitter.

20. The system of claim 11 , wherein the instructions, when executed by the one or more computing devices, further cause:

prompting the link submitter to enter/submit the second authentication factor based on a use restriction specific to the sharable link.