Golang view.Template函数代码示例

// HandleHome displays a list of stories using gravity to order them
// used for the home page for gravity rank see votes.go
// responds to GET /
func HandleHome(context router.Context) error {

	// Build a query
	q := stories.Query().Limit(listLimit)

	// Select only above 0 points,  Order by rank, then points, then name
	q.Where("points > 0").Order("rank desc, points desc, id desc")

	// Set the offset in pages if we have one
	page := int(context.ParamInt("page"))
	if page > 0 {
		q.Offset(listLimit * page)
	}

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)
	setStoriesMetadata(view, context.Request())
	view.AddKey("page", page)
	view.AddKey("stories", results)
	view.Template("stories/views/index.html.got")

	if context.Param("format") == ".xml" {
		view.Layout("")
		view.Template("stories/views/index.xml.got")
	}

	return view.Render()

}

// errHandler renders an error using error templates if available
func errHandler(context router.Context, e error) {

	// Cast the error to a status error if it is one, if not wrap it in a Status 500 error
	err := router.ToStatusError(e)

	view := view.New(context)

	view.AddKey("title", err.Title)
	view.AddKey("message", err.Message)

	if !context.Production() {
		view.AddKey("status", err.Status)
		view.AddKey("file", err.FileLine())
		view.AddKey("error", err.Err)
	}

	view.Template("app/views/error.html.got")

	// Log 404 as info only
	if err.Status == 404 {
		context.Logf("#info %s\n", err)
	} else {
		context.Logf("#error %s\n", err)
	}

	view.Render()
}

// errHandler renders an error using error templates if available
func errHandler(context router.Context, e error) {

	// Cast the error to a status error if it is one, if not wrap it in a Status 500 error
	err := router.ToStatusError(e)

	view := view.New(context)

	view.AddKey("title", err.Title)
	view.AddKey("message", err.Message)

	if !context.Production() {
		view.AddKey("status", err.Status)
		view.AddKey("file", err.FileLine())
		view.AddKey("error", err.Err)
	}

	// Set the status correctly for errors
	context.Writer().WriteHeader(err.Status)

	// Use our error template
	view.Template("app/views/error.html.got")

	context.Logf("#error %s\n", err)
	view.Render()
}

// HandleShowHome serves our home page
func homeHandler(context router.Context) error {

	view := view.New(context)
	view.AddKey("title", "Fragmenta app")
	view.Template("app/views/home.html.got")
	return view.Render()
}

// HandleHome displays a list of stories using gravity to order them
// used for the home page for gravity rank see votes.go
func HandleHome(context router.Context) error {

	// Build a query
	q := stories.Query().Limit(listLimit)

	// Select only above 0 points,  Order by rank, then points, then name
	q.Where("points > 0").Order("rank desc, points desc, id desc")

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)
	view.AddKey("stories", results)
	view.AddKey("meta_title", "Golang News")
	view.AddKey("meta_desc", "News for Go Hackers, in the style of Hacker News. A curated selection of the latest links about the Go programming language.")
	view.AddKey("meta_keywords", "golang news, blog, links, go developers, go web apps, web applications, fragmenta")
	view.AddKey("authenticity_token", authorise.CreateAuthenticityToken(context))

	view.Template("stories/views/index.html.got")
	return view.Render()

}

// HandleUpvoted displays a list of stories the user has upvoted in the past
func HandleUpvoted(context router.Context) error {

	// Build a query
	q := stories.Query().Limit(listLimit)

	// Select only above 0 points,  Order by rank, then points, then name
	q.Where("points > 0").Order("rank desc, points desc, id desc")

	// Select only stories which the user has upvoted
	user := authorise.CurrentUser(context)
	if !user.Anon() {
		// Can we use a join instead?
		v := query.New("votes", "story_id").Select("select story_id as id from votes").Where("user_id=? AND story_id IS NOT NULL AND points > 0", user.Id)

		storyIDs := v.ResultIDs()
		if len(storyIDs) > 0 {
			q.WhereIn("id", storyIDs)
		}
	}

	// Set the offset in pages if we have one
	page := int(context.ParamInt("page"))
	if page > 0 {
		q.Offset(listLimit * page)
	}

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)
	setStoriesMetadata(view, context.Request())
	view.AddKey("page", page)
	view.AddKey("stories", results)
	view.Template("stories/views/index.html.got")

	if context.Param("format") == ".xml" {
		view.Layout("")
		view.Template("stories/views/index.xml.got")
	}

	return view.Render()

}

// render the given page, with metadata set
func render(context router.Context, page *pages.Page) error {
	// Render the template
	view := view.New(context)
	view.AddKey("page", page)
	view.AddKey("page", page)
	view.AddKey("meta_title", page.Name)
	view.AddKey("meta_desc", page.Summary)
	view.AddKey("meta_keywords", page.Keywords)
	view.Template("pages/views/show.html.got")
	return view.Render()
}

func renderPage(context router.Context, page *pages.Page) error {

	view := view.New(context)

	// Setup context for template
	if page.Template != "" {
		view.Template(page.Template)
	} else {
		view.Template("pages/views/show.html.got")
	}

	view.AddKey("page", page)
	view.AddKey("meta_title", page.Name)
	view.AddKey("meta_desc", page.Summary)
	view.AddKey("meta_keywords", page.Keywords)

	// Serve template
	context.Logf("#info Rendering page for path %s", context.Path())
	return view.Render()
}

// HandleCode displays a list of stories linking to repos (github etc) using gravity to order them
// responds to GET /stories/code
func HandleCode(context router.Context) error {

	// Build a query
	q := stories.Query().Where("points > -6").Order("rank desc, points desc, id desc").Limit(listLimit)

	// Restrict to stories with have a url starting with github.com or bitbucket.org
	// other code repos can be added later
	q.Where("url ILIKE 'https://github.com%'").OrWhere("url ILIKE 'https://bitbucket.org'")

	// Set the offset in pages if we have one
	page := int(context.ParamInt("page"))
	if page > 0 {
		q.Offset(listLimit * page)
	}

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)
	setStoriesMetadata(view, context.Request())
	view.AddKey("page", page)
	view.AddKey("stories", results)
	//	view.AddKey("tags", []string{"web", "mobile", "data", "email", "crypto", "data", "graphics", "ui", "security"})

	// TODO: remove these calls and put in a filter
	// - given it is not too expensive, we could just generate tokens on every request

	view.Template("stories/views/index.html.got")

	if context.Param("format") == ".xml" {
		view.Layout("")
		view.Template("stories/views/index.xml.got")
	}

	return view.Render()

}

// HandleCode displays a list of stories linking to repos (github etc) using gravity to order them
// responds to GET /stories/code
func HandleCode(context router.Context) error {

	// Build a query
	q := stories.Query().Where("points > -6").Order("rank desc, points desc, id desc").Limit(listLimit)

	// Restrict to stories with have a url starting with github.com or bitbucket.org
	// other code repos can be added later
	q.Where("url ILIKE 'https://github.com%'").OrWhere("url ILIKE 'https://bitbucket.org'")

	// Set the offset in pages if we have one
	page := int(context.ParamInt("page"))
	if page > 0 {
		q.Offset(listLimit * page)
	}

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)
	view.AddKey("page", page)
	view.AddKey("stories", results)
	view.AddKey("pubdate", storiesModTime(results))
	view.AddKey("meta_title", "Go Code")
	view.AddKey("meta_desc", context.Config("meta_desc"))
	view.AddKey("meta_keywords", context.Config("meta_keywords"))
	view.AddKey("meta_rss", storiesXMLPath(context))
	view.Template("stories/views/index.html.got")

	if context.Param("format") == ".xml" {
		view.Layout("")
		view.Template("stories/views/index.xml.got")
	}

	return view.Render()

}

// HandleIndex displays a list of stories at /stories
func HandleIndex(context router.Context) error {

	// Build a query
	q := stories.Query().Limit(listLimit)

	// Order by date by default
	q.Where("points > -6").Order("created_at desc")

	// Filter if necessary - this assumes name and summary cols
	filter := context.Param("q")
	if len(filter) > 0 {

		// Replace special characters with escaped sequence
		filter = strings.Replace(filter, "_", "\\_", -1)
		filter = strings.Replace(filter, "%", "\\%", -1)

		wildcard := "%" + filter + "%"

		// Perform a wildcard search for name or url
		q.Where("stories.name ILIKE ? OR stories.url ILIKE ?", wildcard, wildcard)

		// If filtering, order by rank, not by date
		q.Order("rank desc, points desc, id desc")
	}

	// Set the offset in pages if we have one
	page := int(context.ParamInt("page"))
	if page > 0 {
		q.Offset(listLimit * page)
	}

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)

	setStoriesMetadata(view, context.Request())
	view.AddKey("page", page)
	view.AddKey("stories", results)

	if context.Param("format") == ".xml" {
		view.Layout("")
		view.Template("stories/views/index.xml.got")
	}

	return view.Render()

}

// HandleHome displays a list of stories using gravity to order them
// used for the home page for gravity rank see votes.go
// responds to GET /
func HandleHome(context router.Context) error {

	// Build a query
	q := stories.Query().Limit(listLimit)

	// Select only above 0 points,  Order by rank, then points, then name
	q.Where("points > 0").Order("rank desc, points desc, id desc")

	// Set the offset in pages if we have one
	page := int(context.ParamInt("page"))
	if page > 0 {
		q.Offset(listLimit * page)
	}

	// Fetch the stories
	results, err := stories.FindAll(q)
	if err != nil {
		return router.InternalError(err)
	}

	// Render the template
	view := view.New(context)
	view.AddKey("page", page)
	view.AddKey("stories", results)
	view.Template("stories/views/index.html.got")
	view.AddKey("pubdate", storiesModTime(results))
	view.AddKey("meta_title", fmt.Sprintf("%s, %s", context.Config("meta_title"), context.Config("meta_desc")))
	view.AddKey("meta_desc", context.Config("meta_desc"))
	view.AddKey("meta_keywords", context.Config("meta_keywords"))
	view.AddKey("meta_rss", storiesXMLPath(context))

	if context.Param("format") == ".xml" {
		view.Layout("")
		view.Template("stories/views/index.xml.got")
	}

	return view.Render()

}

// HandleShowSetup shows the setup page at /fragmenta/setup
func HandleShowSetup(context router.Context) error {

	// Setup context for template
	view := view.New(context)

	// If we have pages or users already, do not proceed
	if !missingUsersAndPages() {
		return router.NotAuthorizedError(nil)
	}

	view.Template("pages/views/setup.html.got")
	return view.Render()
}

// HandleShowName displays a single user by name
func HandleShowName(context router.Context) error {

	// Find the user
	user, err := users.FindName(context.Param("name"))
	if err != nil {
		return router.NotFoundError(err)
	}

	// Render the template
	view := view.New(context)
	view.AddKey("user", user)
	view.Template("users/views/show.html.got")
	return view.Render()
}

// Send sends mail
func Send(recipients []string, subject string, template string, context map[string]interface{}) error {

	// At present we use sendgrid, we may later allow many mail services to be used
	//	sg := sendgrid.NewSendGridClient(user, secret)
	sg := sendgrid.NewSendGridClientWithApiKey(secret)

	message := sendgrid.NewMail()
	message.SetFrom(from)
	message.AddTos(recipients)
	message.SetSubject(subject)

	// Hack for now, consider options TODO
	if context["reply_to"] != nil {
		replyTo := context["reply_to"].(string)
		message.SetReplyTo(replyTo)
	}

	// Load the template, and substitute using context
	// We should possibly set layout from caller too?
	view := view.New(&renderContext{})
	view.Template(template)
	view.Context(context)

	// We have a panic: runtime error: invalid memory address or nil pointer dereference
	// because of reloading templates on the fly I think
	// github.com/fragmenta/view/parser/template.html.go:90
	html, err := view.RenderString()
	if err != nil {
		return err
	}

	// For debug, print message
	//fmt.Printf("SENDING MAIL:\n%s", html)

	message.SetHTML(html)

	return sg.Send(message)
}