This is a port of gogs/gogs#4398
The only changes made by myself are:
Add locales
Add some JS to the UI
Otherwise all code credit goes to @aboron
Resolves#10829
Signed-off-by: jolheiser <john.olheiser@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>
* Add placeholder text for send testing email button in admin/config
* Change placeholder text to expecting email address
* Localize placeholder text
* Apply suggestion from @silverwind
ok
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
* Update Octicons to v10
Besides a few renames, these icons are no longer present in v10 that we've
used, so had to change:
file-symlink-directory -> file-submodule
internal-repo -> repo
repo-force-push -> repo-push
repo-template-private -> repo-template
Fixes: https://github.com/go-gitea/gitea/issues/11889
Ref: https://github.com/primer/octicons/releases/tag/v10.0.0
* add custom sliders svg for removed octicon-settings
* apply suggestion
* fix triangles and use play on admin dashboard
* add custom mirror svg
* add missing build files
* unify custom svgs
* move to octicon-repo-clone to gitea-mirror
* use octicon-x on conflicts
* tweak timeline icons
* tweak comment buttons
* update settings icon to octicons v1
* switch to octicon-mirror and octicon-tools
* replace two wiki buttons with octicons
* remove whitespace in svg sources
* Fix filepath basename on Windows for SVG bindata (#12241)
* move octicons to devDependencies
* move back to dependencies
* move svgo to devDependencies again
Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
* Remove spurious spacing between Maintenance Operations and its table on dashboard
* Prevent (EXTRA string) comments in Task headers
* Redirect tasks started from monitor page back to monitor
* Fix#12107 - redirects from process cancel should use AppSubUrl
* When wrapping queues set the name correctly
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Properly truncate system notices
As noted in #11658 the system notifications list will always suffix
system notices with ... even when the notice is longer than 120
characters.
Instead we should use .text.truncate to auto truncate and make the
notices clickable to view their details.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* As per @CirnoT make table cell clickable
* ensure that pre wraps
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
* Refactor Cron and merge dashboard tasks
* Merge Cron and Dashboard tasks
* Make every cron task report a system notice on completion
* Refactor the creation of these tasks
* Ensure that execution counts of tasks is correct
* Allow cron tasks to be started from the cron page
* golangci-lint fixes
* Enforce that only one task with the same name can be registered
Signed-off-by: Andrew Thornton <art27@cantab.net>
* fix name check
Signed-off-by: Andrew Thornton <art27@cantab.net>
* as per @guillep2k
* as per @lafriks
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Add git.CommandContext variants
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Fomantic-ui's action button syntax requires that the button is
the next sibling of the input it is attached to and that they
are both children of a div.action.
Fix#11375
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
That's because many notic have more than one lines. So I think
pre is more better to used in here than p
Signed-off-by: a1012112796 <1012112796@qq.com>
* Make sure that sendmail processes register with the process manager
* Provide a timeout for these (initially of 5 minutes)
* Add configurable value and tie in to documentation
* Tie in to the admin config page.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* ui: limit managers prohibit themself to login
Because I think it's crazy and not reasonale , that if a user can
prohibit themself to login. so suggest limit this choice on ui
Signed-off-by: a1012112796 <1012112796@qq.com>
* skip self Prohibit Login in post event handle
* fix comment
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
* Create system webhook column (and migration)
* Create system webhook DB methods
Based on the default webhook ones
* Modify router to handle system webhooks and default ones
* Remove old unused admin nav template
* Adjust orgRepoCtx to differentiate system and default webhook URLs
* Assign IsSystemWebhook when creating webhooks
* Correctly use booleans for IsSystemWebhook
* Use system webhooks when preparing webhooks for payload
* Add UI and locale changes
* Use router params to differentiate admin hook pages
* Fix deleting admin webhooks and rename method
* Add clarity to webhook docs
* Revert "Remove old unused admin nav template"
This reverts commit 191a20a7389fe5f6256b0ad6aafd04b9b0e295c5.
* Rename WebHooksNewPost to GiteaHooksNewPost for clarity
* Reintroduce blank line lost during merge conflict
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
* Make WorkerPools and Queues flushable
Adds Flush methods to Queues and the WorkerPool
Further abstracts the WorkerPool
Adds a final step to Flush the queues in the defer from PrintCurrentTest
Fixes an issue with Settings inheritance in queues
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Change to for loop
* Add IsEmpty and begin just making the queues composed WorkerPools
* subsume workerpool into the queues and create a flushable interface
* Add manager command
* Move flushall to queue.Manager and add to testlogger
* As per @guillep2k
* as per @guillep2k
* Just make queues all implement flushable and clean up the wrapped queue flushes
* cope with no timeout
Co-authored-by: Lauris BH <lauris@nix.lv>
* Add support for database schema
* Require setting search_path for the db user
* Add schema setting to admin/config.tmpl
* Use a schema different from default for psql tests
* Update postgres scripts to use custom schema
* Update to xorm/core 0.7.3 and xorm/xorm c37aff9b3a
* Fix migration test
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
* Restricted users (#4334): initial implementation
* Add User.IsRestricted & UI to edit it
* Pass user object instead of user id to places where IsRestricted flag matters
* Restricted users: maintain access rows for all referenced repos (incl public)
* Take logged in user & IsRestricted flag into account in org/repo listings, searches and accesses
* Add basic repo access tests for restricted users
Signed-off-by: Manush Dodunekov <manush@stendahls.se>
* Mention restricted users in the faq
Signed-off-by: Manush Dodunekov <manush@stendahls.se>
* Revert unnecessary change `.isUserPartOfOrg` -> `.IsUserPartOfOrg`
Signed-off-by: Manush Dodunekov <manush@stendahls.se>
* Remove unnecessary `org.IsOrganization()` call
Signed-off-by: Manush Dodunekov <manush@stendahls.se>
* Revert to an `int64` keyed `accessMap`
* Add type `userAccess`
* Add convenience func updateUserAccess()
* Turn accessMap into a `map[int64]userAccess`
Signed-off-by: Manush Dodunekov <manush@stendahls.se>
* or even better: `map[int64]*userAccess`
* updateUserAccess(): use tighter syntax as suggested by lafriks
* even tighter
* Avoid extra loop
* Don't disclose limited orgs to unauthenticated users
* Don't assume block only applies to orgs
* Use an array of `VisibleType` for filtering
* fix yet another thinko
* Ok - no need for u
* Revert "Ok - no need for u"
This reverts commit 5c3e886aabd5acd997a3b35687d322439732c200.
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
* Graceful: Create callbacks to with contexts
* Graceful: Say when Gitea is completely finished
* Graceful: Git and Process within HammerTime
Force all git commands to terminate at HammerTime
Force all process commands to terminate at HammerTime
Move almost all git processes to run as git Commands
* Graceful: Always Hammer after Shutdown
* ProcessManager: Add cancel functionality
* Fix tests
* Make sure that process.Manager.Kill() cancels
* Make threadsafe access to Processes and remove own unused Kill
* Remove cmd from the process manager as it is no longer used
* the default context is the correct context
* get rid of double till
* Properly fix#7127
Although #7300 properly shadows the password from the virtual session
provider, the template displaying the provider config still presumed
that the config was JSON.
This PR updates the template and properly hides the Virtual Session
provider.
Fixes#7127
* update per @silverwind's suggestion
* Add single sign-on support via SSPI on Windows
* Ensure plugins implement interface
* Ensure plugins implement interface
* Move functions used only by the SSPI auth method to sspi_windows.go
* Field SSPISeparatorReplacement of AuthenticationForm should not be required via binding, as binding will insist the field is non-empty even if another login type is selected
* Fix breaking of oauth authentication on download links. Do not create new session with SSPI authentication on download links.
* Update documentation for the new 'SPNEGO with SSPI' login source
* Mention in documentation that ROOT_URL should contain the FQDN of the server
* Make sure that Contexter is not checking for active login sources when the ORM engine is not initialized (eg. when installing)
* Always initialize and free SSO methods, even if they are not enabled, as a method can be activated while the app is running (from Authentication sources)
* Add option in SSPIConfig for removing of domains from logon names
* Update helper text for StripDomainNames option
* Make sure handleSignIn() is called after a new user object is created by SSPI auth method
* Remove default value from text of form field helper
Co-Authored-By: Lauris BH <lauris@nix.lv>
* Remove default value from text of form field helper
Co-Authored-By: Lauris BH <lauris@nix.lv>
* Remove default value from text of form field helper
Co-Authored-By: Lauris BH <lauris@nix.lv>
* Only make a query to the DB to check if SSPI is enabled on handlers that need that information for templates
* Remove code duplication
* Log errors in ActiveLoginSources
Co-Authored-By: Lauris BH <lauris@nix.lv>
* Revert suffix of randomly generated E-mails for Reverse proxy authentication
Co-Authored-By: Lauris BH <lauris@nix.lv>
* Revert unneeded white-space change in template
Co-Authored-By: Lauris BH <lauris@nix.lv>
* Add copyright comments at the top of new files
* Use loopback name for randomly generated emails
* Add locale tag for the SSPISeparatorReplacement field with proper casing
* Revert casing of SSPISeparatorReplacement field in locale file, moving it up, next to other form fields
* Update docs/content/doc/features/authentication.en-us.md
Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>
* Remove Priority() method and define the order in which SSO auth methods should be executed in one place
* Log authenticated username only if it's not empty
* Rephrase helper text for automatic creation of users
* Return error if more than one active SSPI auth source is found
* Change newUser() function to return error, letting caller log/handle the error
* Move isPublicResource, isPublicPage and handleSignIn functions outside SSPI auth method to allow other SSO methods to reuse them if needed
* Refactor initialization of the list containing SSO auth methods
* Validate SSPI settings on POST
* Change SSPI to only perform authentication on its own login page, API paths and download links. Leave Toggle middleware to redirect non authenticated users to login page
* Make 'Default language' in SSPI config empty, unless changed by admin
* Show error if admin tries to add a second authentication source of type SSPI
* Simplify declaration of global variable
* Rebuild gitgraph.js on Linux
* Make sure config values containing only whitespace are not accepted
* static url
* add cors support for static resources
* [assets] work on the migration to configurable url for assets
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* [misc] fix whitespace
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* [assets] fix the loading of the manifest.json
It is generated dynamically, and as such can not be served by the cdn.
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* Revert "add cors support for static resources"
This reverts commit 42f964fd181dbb8b139808b9be623470d4f0e40f
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* [docs] add the STATIC_URL_PREFIX option
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* [docs] reverse-proxy: nginx: add two setups for STATIC_URL_PREFIX
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* [assets] migrate the url of a new asset to the static url prefix
REF: f2a3abc683ad4b2177b7c7c6160a2c0b4316120a
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
* migrate gplus to google oauth2 provider. this still provides support for old gplus connections.
* Update models/oauth2.go
Co-Authored-By: Antoine GIRARD <sapk@users.noreply.github.com>
* make vendor
* Only show repository avatar in list when one was selected
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
* Adds fallback configuration option for repository avatar
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
* Implements repository avatar fallback
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
* Adds admin task for deleting generated repository avatars
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
* Solve linting issues
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
* Save avatar before updating database
* Linting
* Update models/repo.go
Co-Authored-By: zeripath <art27@cantab.net>
* Panic don't fatal on create new logger
Fixes#5854
Signed-off-by: Andrew Thornton <art27@cantab.net>
* partial broken
* Update the logging infrastrcture
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Reset the skip levels for Fatal and Error
Signed-off-by: Andrew Thornton <art27@cantab.net>
* broken ncsa
* More log.Error fixes
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Remove nal
* set log-levels to lowercase
* Make console_test test all levels
* switch to lowercased levels
* OK now working
* Fix vetting issues
* Fix lint
* Fix tests
* change default logging to match current gitea
* Improve log testing
Signed-off-by: Andrew Thornton <art27@cantab.net>
* reset error skip levels to 0
* Update documentation and access logger configuration
* Redirect the router log back to gitea if redirect macaron log but also allow setting the log level - i.e. TRACE
* Fix broken level caching
* Refactor the router log
* Add Router logger
* Add colorizing options
* Adjust router colors
* Only create logger if they will be used
* update app.ini.sample
* rename Attribute ColorAttribute
* Change from white to green for function
* Set fatal/error levels
* Restore initial trace logger
* Fix Trace arguments in modules/auth/auth.go
* Properly handle XORMLogger
* Improve admin/config page
* fix fmt
* Add auto-compression of old logs
* Update error log levels
* Remove the unnecessary skip argument from Error, Fatal and Critical
* Add stacktrace support
* Fix tests
* Remove x/sync from vendors?
* Add stderr option to console logger
* Use filepath.ToSlash to protect against Windows in tests
* Remove prefixed underscores from names in colors.go
* Remove not implemented database logger
This was removed from Gogs on 4 Mar 2016 but left in the configuration
since then.
* Ensure that log paths are relative to ROOT_PATH
* use path.Join
* rename jsonConfig to logConfig
* Rename "config" to "jsonConfig" to make it clearer
* Requested changes
* Requested changes: XormLogger
* Try to color the windows terminal
If successful default to colorizing the console logs
* fixup
* Colorize initially too
* update vendor
* Colorize logs on default and remove if this is not a colorizing logger
* Fix documentation
* fix test
* Use go-isatty to detect if on windows we are on msys or cygwin
* Fix spelling mistake
* Add missing vendors
* More changes
* Rationalise the ANSI writer protection
* Adjust colors on advice from @0x5c
* Make Flags a comma separated list
* Move to use the windows constant for ENABLE_VIRTUAL_TERMINAL_PROCESSING
* Ensure matching is done on the non-colored message - to simpify EXPRESSION
Include the current CustomPath location in the admin section and also
display GITEA_WORK_DIR and/or GITEA_CUSTOM env var if they are set.
Right now there is no easy way to see this information, and if you try
and help most users they won't be able to tell you anything about these
values -- just that their custom template isn't working, files aren't in
the right place, etc... Now you can see all paths and if they were set
by ENV or not.
Partially implement #770.
Add "Default Webhooks" page in site admin UI.
Persist to the existing webhooks table, but store with RepoID=0 and OrgID=0.
Upon repo creation, copy the set of default webhooks into the new repo.
* Add LDAP Key Synchronization feature
Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>
* Add migration: add login source id column for public_key table
* Only update keys if needed
* Add function to only list pubkey synchronized from ldap
* Only list pub ssh keys synchronized from ldap. Do not sort strings as ExistsInSlice does it.
* Only get keys belonging to current login source id
* Set default login source id to 0
* Some minor cleanup. Add integration tests (updete dep testify)
The choice regarding which forms should or should not trigger a warning
is subjective. I tried to be consistent and not warn about forms that:
- run an action, rather than edit data: search, send an email.
- delete data: a warning about losing data would be confusing
Note that forms on sign-in pages were already ignored (using a selector,
rather than an explicit class on the form element).
Fixes#3698.
* refactor struct's time to remove unnecessary memory usage
* use AsTimePtr simple code
* fix tests
* fix time compare
* fix template on gpg
* use AddDuration instead of Add
* Create option to disable githooks globally via configuration file
* Update comment in app.ini to align with @ethantkoenig's suggestion
Signed-off-by: Matti Ranta <matti@mdranta.net>
* Added comment's hashtag to url for mail notifications.
* Added explanation to return statement + documentation.
* Replacing in-line link generation with HTMLURL. (+gofmt)
* Replaced action-based model with nil-based model. (+gofmt)
* Replaced mailIssueActionToParticipants with mailIssueCommentToParticipants.
* Updating comment for mailIssueCommentToParticipants
* Added link to comment in "Dashboard"
* Deleting feed entry if a comment is going to be deleted
* Added migration
* Added improved migration to add a CommentID column to action.
* Added improved links to comments in feed entries.
* Fixes#1956 by filtering for deleted comments that are referenced in actions.
* Introducing "IsDeleted" column to action.
* Adding design draft (not functional)
* Adding database models for stopwatches and trackedtimes
* See go-gitea/gitea#967
* Adding design draft (not functional)
* Adding translations and improving design
* Implementing stopwatch (for timetracking)
* Make UI functional
* Add hints in timeline for time tracking events
* Implementing timetracking feature
* Adding "Add time manual" option
* Improved stopwatch
* Created report of total spent time by user
* Only showing total time spent if theire is something to show.
* Adding license headers.
* Improved error handling for "Add Time Manual"
* Adding @sapks 's changes, refactoring
* Adding API for feature tracking
* Adding unit test
* Adding DISABLE/ENABLE option to Repository settings page
* Improving translations
* Applying @sapk 's changes
* Removing repo_unit and using IssuesSetting for disabling/enabling timetracker
* Adding DEFAULT_ENABLE_TIMETRACKER to config, installation and admin menu
* Improving documentation
* Fixing vendor/ folder
* Changing timtracking routes by adding subgroups /times and /times/stopwatch (Proposed by @lafriks )
* Restricting write access to timetracking based on the repo settings (Proposed by @lafriks )
* Fixed minor permissions bug.
* Adding CanUseTimetracker and IsTimetrackerEnabled in ctx.Repo
* Allow assignees and authors to track there time too.
* Fixed some build-time-errors + logical errors.
* Removing unused Get...ByID functions
* Moving IsTimetrackerEnabled from context.Repository to models.Repository
* Adding a seperate file for issue related repo functions
* Adding license headers
* Fixed GetUserByParams return 404
* Moving /users/:username/times to /repos/:username/:reponame/times/:username for security reasons
* Adding /repos/:username/times to get all tracked times of the repo
* Updating sdk-dependency
* Updating swagger.v1.json
* Adding warning if user has already a running stopwatch (auto-timetracker)
* Replacing GetTrackedTimesBy... with GetTrackedTimes(options FindTrackedTimesOptions)
* Changing code.gitea.io/sdk back to code.gitea.io/sdk
* Correcting spelling mistake
* Updating vendor.json
* Changing GET stopwatch/toggle to POST stopwatch/toggle
* Changing GET stopwatch/cancel to POST stopwatch/cancel
* Added migration for stopwatches/timetracking
* Fixed some access bugs for read-only users
* Added default allow only contributors to track time value to config
* Fixed migration by chaging x.Iterate to x.Find
* Resorted imports
* Moved Add Time Manually form to repo_form.go
* Removed "Seconds" field from Add Time Manually
* Resorted imports
* Improved permission checking
* Fixed some bugs
* Added integration test
* gofmt
* Adding integration test by @lafriks
* Added created_unix to comment fixtures
* Using last event instead of a fixed event
* Adding another integration test by @lafriks
* Fixing bug Timetracker enabled causing error 500 at sidebar.tpl
* Fixed a refactoring bug that resulted in hiding "HasUserStopwatch" warning.
* Returning TrackedTime instead of AddTimeOption at AddTime.
* Updating SDK from go-gitea/go-sdk#69
* Resetting Go-SDK back to default repository
* Fixing test-vendor by changing ini back to original repository
* Adding "tags" to swagger spec
* govendor sync
* Removed duplicate
* Formatting templates
* Adding IsTimetrackingEnabled checks to API
* Improving translations / english texts
* Improving documentation
* Updating swagger spec
* Fixing integration test caused be translation-changes
* Removed encoding issues in local_en-US.ini.
* "Added" copyright line
* Moved unit.IssuesConfig().EnableTimetracker into a != nil check
* Removed some other encoding issues in local_en-US.ini
* Improved javascript by checking if data-context exists
* Replaced manual comment creation with CreateComment
* Removed unnecessary code
* Improved error checking
* Small cosmetic changes
* Replaced int>string>duration parsing with int>duration parsing
* Fixed encoding issues
* Removed unused imports
Signed-off-by: Jonas Franz <info@jonasfranz.software>
* add google+
* sort signin oauth2 providers based on the name so order is always the same
* update auth tip for google+
* add gitlab provider
* add bitbucket provider (and some go fmt)
* add twitter provider
* add facebook provider
* add dropbox provider
* add openid connect provider incl. new format of tips section in "Add New Source"
* lower the amount of disk storage for each session to prevent issues while building cross platform (and disk overflow)
* imports according to goimport and code style
* make it possible to set custom urls to gitlab and github provider (only these could have a different host)
* split up oauth2 into multiple files
* small typo in comment
* fix indention
* fix indentation
* fix new line before external import
* fix layout of signin part
* update "broken" dependency
* Implementation of the feature to view repository size in admin panel
* Move GetRepoSize to git module
* Repository.RepoSize -> Repository.Size
* RepoSize -> Size in template
* Redo a few bits and pieces
* Update size when syncing mirror or forking
* Remove GetRepoSize
* Changed fatal errors to error message
* Copy migration code from Gogs
* make fmt
* Allow ENABLE_OPENID_SIGNUP to depend on DISABLE_REGISTRATION
Omit the configuration variable (the default) to be dependent.
Fixes#1363
* Move OpenID settings under Service object
* Show OpenID SignUp and SignIn status in admin panel / configuration
* Fix for #828
Add build tags to ldflags and print in version output
Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>
* Reworked formatBuiltWith function
Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>
* Add tags to version information in admin panel
Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>
* Added new variable for use on admin page.
Signed-off-by: Jonas Östanbäck <jonas.ostanback@gmail.com>
* Fixed incorrect indentation
* initial stuff for oauth2 login, fails on:
* login button on the signIn page to start the OAuth2 flow and a callback for each provider
Only GitHub is implemented for now
* show login button only when the OAuth2 consumer is configured (and activated)
* create macaron group for oauth2 urls
* prevent net/http in modules (other then oauth2)
* use a new data sessions oauth2 folder for storing the oauth2 session data
* add missing 2FA when this is enabled on the user
* add password option for OAuth2 user , for use with git over http and login to the GUI
* add tip for registering a GitHub OAuth application
* at startup of Gitea register all configured providers and also on adding/deleting of new providers
* custom handling of errors in oauth2 request init + show better tip
* add ExternalLoginUser model and migration script to add it to database
* link a external account to an existing account (still need to handle wrong login and signup) and remove if user is removed
* remove the linked external account from the user his settings
* if user is unknown we allow him to register a new account or link it to some existing account
* sign up with button on signin page (als change OAuth2Provider structure so we can store basic stuff about providers)
* from gorilla/sessions docs:
"Important Note: If you aren't using gorilla/mux, you need to wrap your handlers with context.ClearHandler as or else you will leak memory!"
(we're using gorilla/sessions for storing oauth2 sessions)
* use updated goth lib that now supports getting the OAuth2 user if the AccessToken is still valid instead of re-authenticating (prevent flooding the OAuth2 provider)
