Get site collection url, site url and list url from a full uri?

Question

If I have incoming: only URI's of the format http://a.b.c/d/e/f/g/h/i/j/k/l/m/n/o/p.docx
(And these are coming from multiple farms and multiple site collections) (and i have a web api on some remote server) (and have all the authentication details)
And I want to query just the single the item via csom : check one column and if value="yes" then download the doc:
a. how do i get the absolute site url out of it for " clientcontext ctx = new clientcontext(THISURL) "
b. how do i then get the list uri out of it to push a caml query to to then retrieve it
I could :
a. strip off the filename, that is the easy part :)
b.  I could paste "/_api/contextinfo" behind it and POST it first as a httprequest. Then first get the site and web url and later on
find a way to find the list url (which is probably the first item behind the fullWebUrl), but it seems weird to mix this in the mix
Basically im looking for something that tells me what is what in http://a.b.c/d/e/f/g/h/i/j/k/l/m/n/o/p.docx

Answer 1

Sorry, GetList is only available in the O365 version of Microsoft.SharePoint.Client. If you could test for a root site collection and if there is not one then take the scheme ... + Uri.segments[0] and then get the context. After that you can use
the GetFileByServerRelativeUrl. The following demonstrates this.
public static void GetFileList()
string fileUrl = "http://basesmc15/teamonesubone/teamsubonesubone/Shared%20Documents/folderholder/newauthor6.pdf";
Uri fileUri = new Uri(fileUrl);
Uri webUrl;
ClientContext rootContext = new ClientContext(fileUri.Scheme + Uri.SchemeDelimiter + fileUri.Host);
webUrl = Web.WebUrlFromPageUrlDirect(rootContext, fileUri);
ClientContext subContext = new ClientContext(webUrl.ToString());
File file = subContext.Web.GetFileByServerRelativeUrl(fileUri.AbsolutePath);
List list = file.ListItemAllFields.ParentList;
subContext.Load(list);
subContext.ExecuteQuery();
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