mirror of https://github.com/jlelse/GoBlog
340 lines
9.5 KiB
Go
340 lines
9.5 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"net/http"
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"reflect"
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"strconv"
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"strings"
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"github.com/go-chi/chi"
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"github.com/vcraescu/go-paginator"
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)
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var errPostNotFound = errors.New("post not found")
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type Post struct {
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Path string `json:"path"`
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Content string `json:"content"`
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Published string `json:"published"`
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Updated string `json:"updated"`
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Parameters map[string][]string `json:"parameters"`
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Blog string `json:"blog"`
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Section string `json:"section"`
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// Not persisted
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Slug string `json:"slug"`
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}
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func servePost(w http.ResponseWriter, r *http.Request) {
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if strings.HasSuffix(r.URL.Path, ".as") {
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servePostActivityStreams(w, r)
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return
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}
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path := slashTrimmedPath(r)
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post, err := getPost(r.Context(), path)
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if err == errPostNotFound {
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serve404(w, r)
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return
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} else if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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render(w, templatePost, &renderData{
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blogString: post.Blog,
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Data: post,
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})
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}
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type indexTemplateData struct {
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Blog string
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Title string
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Description string
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Posts []*Post
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HasPrev bool
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HasNext bool
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First string
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Prev string
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Next string
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}
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type postPaginationAdapter struct {
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context context.Context
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config *postsRequestConfig
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nums int
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}
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func (p *postPaginationAdapter) Nums() int {
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if p.nums == 0 {
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p.nums, _ = countPosts(p.context, p.config)
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}
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return p.nums
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}
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func (p *postPaginationAdapter) Slice(offset, length int, data interface{}) error {
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if reflect.TypeOf(data).Kind() != reflect.Ptr {
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panic("data has to be a pointer")
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}
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modifiedConfig := *p.config
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modifiedConfig.offset = offset
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modifiedConfig.limit = length
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posts, err := getPosts(p.context, &modifiedConfig)
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reflect.ValueOf(data).Elem().Set(reflect.ValueOf(&posts).Elem())
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return err
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}
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func serveHome(blog string, path string, ft feedType) func(w http.ResponseWriter, r *http.Request) {
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return serveIndex(&indexConfig{
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blog: blog,
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path: path,
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feed: ft,
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})
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}
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func serveSection(blog string, path string, section *section, ft feedType) func(w http.ResponseWriter, r *http.Request) {
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return serveIndex(&indexConfig{
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blog: blog,
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path: path,
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section: section,
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feed: ft,
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})
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}
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func serveTaxonomy(blog string, tax *taxonomy) func(w http.ResponseWriter, r *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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allValues, err := allTaxonomyValues(blog, tax.Name)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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render(w, templateTaxonomy, &renderData{
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blogString: blog,
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Data: struct {
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Taxonomy *taxonomy
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TaxonomyValues []string
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}{
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Taxonomy: tax,
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TaxonomyValues: allValues,
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},
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})
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}
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}
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func serveTaxonomyValue(blog string, path string, tax *taxonomy, value string, ft feedType) func(w http.ResponseWriter, r *http.Request) {
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return serveIndex(&indexConfig{
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blog: blog,
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path: path,
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tax: tax,
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taxValue: value,
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feed: ft,
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})
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}
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func servePhotos(blog string) func(w http.ResponseWriter, r *http.Request) {
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return serveIndex(&indexConfig{
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blog: blog,
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path: appConfig.Blogs[blog].Photos.Path,
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onlyWithParameter: appConfig.Blogs[blog].Photos.Parameter,
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template: templatePhotos,
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})
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}
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type indexConfig struct {
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blog string
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path string
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section *section
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tax *taxonomy
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taxValue string
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feed feedType
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onlyWithParameter string
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template string
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}
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func serveIndex(ic *indexConfig) func(w http.ResponseWriter, r *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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pageNoString := chi.URLParam(r, "page")
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pageNo, _ := strconv.Atoi(pageNoString)
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var sections []string
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if ic.section != nil {
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sections = []string{ic.section.Name}
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} else {
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for sectionKey := range appConfig.Blogs[ic.blog].Sections {
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sections = append(sections, sectionKey)
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}
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}
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p := paginator.New(&postPaginationAdapter{context: r.Context(), config: &postsRequestConfig{
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blog: ic.blog,
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sections: sections,
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taxonomy: ic.tax,
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taxonomyValue: ic.taxValue,
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onlyWithParameter: ic.onlyWithParameter,
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}}, appConfig.Blogs[ic.blog].Pagination)
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p.SetPage(pageNo)
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var posts []*Post
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err := p.Results(&posts)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// Meta
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var title, description string
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if ic.tax != nil {
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title = fmt.Sprintf("%s: %s", ic.tax.Title, ic.taxValue)
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} else if ic.section != nil {
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title = ic.section.Title
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description = ic.section.Description
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}
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// Check if feed
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if ic.feed != noFeed {
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generateFeed(ic.blog, ic.feed, w, r, posts, title, description)
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return
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}
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// Navigation
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prevPage, err := p.PrevPage()
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if err == paginator.ErrNoPrevPage {
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prevPage = p.Page()
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}
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nextPage, err := p.NextPage()
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if err == paginator.ErrNoNextPage {
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nextPage = p.Page()
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}
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template := ic.template
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if len(template) == 0 {
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template = templateIndex
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}
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render(w, template, &renderData{
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blogString: ic.blog,
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Data: &indexTemplateData{
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Title: title,
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Description: description,
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Posts: posts,
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HasPrev: p.HasPrev(),
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HasNext: p.HasNext(),
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First: ic.path,
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Prev: fmt.Sprintf("%s/page/%d", ic.path, prevPage),
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Next: fmt.Sprintf("%s/page/%d", ic.path, nextPage),
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},
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})
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}
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}
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func getPost(context context.Context, path string) (*Post, error) {
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posts, err := getPosts(context, &postsRequestConfig{path: path})
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if err != nil {
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return nil, err
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} else if len(posts) == 0 {
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return nil, errPostNotFound
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}
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return posts[0], nil
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}
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type postsRequestConfig struct {
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blog string
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path string
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limit int
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offset int
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sections []string
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taxonomy *taxonomy
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taxonomyValue string
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onlyWithParameter string
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}
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func getPosts(context context.Context, config *postsRequestConfig) (posts []*Post, err error) {
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paths := make(map[string]int)
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var rows *sql.Rows
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defaultSelection := "select p.path, coalesce(content, ''), coalesce(published, ''), coalesce(updated, ''), coalesce(blog, ''), coalesce(section, ''), coalesce(parameter, ''), coalesce(value, '') "
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postsTable := "posts"
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if config.blog != "" {
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postsTable = "(select * from " + postsTable + " where blog = '" + config.blog + "')"
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}
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if config.onlyWithParameter != "" {
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postsTable = "(select distinct p.* from " + postsTable + " p left outer join post_parameters pp on p.path = pp.path where pp.parameter = '" + config.onlyWithParameter + "' and length(coalesce(pp.value, '')) > 1)"
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}
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if config.taxonomy != nil && len(config.taxonomyValue) > 0 {
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postsTable = "(select distinct p.* from " + postsTable + " p left outer join post_parameters pp on p.path = pp.path where pp.parameter = '" + config.taxonomy.Name + "' and lower(pp.value) = lower('" + config.taxonomyValue + "'))"
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}
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if len(config.sections) > 0 {
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postsTable = "(select * from " + postsTable + " where"
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for i, section := range config.sections {
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if i > 0 {
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postsTable += " or"
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}
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postsTable += " section='" + section + "'"
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}
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postsTable += ")"
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}
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defaultTables := " from " + postsTable + " p left outer join post_parameters pp on p.path = pp.path "
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defaultSorting := " order by p.published desc "
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if config.path != "" {
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query := defaultSelection + defaultTables + " where p.path=?" + defaultSorting
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rows, err = appDb.QueryContext(context, query, config.path)
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} else if config.limit != 0 || config.offset != 0 {
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query := defaultSelection + " from (select * from " + postsTable + " p " + defaultSorting + " limit ? offset ?) p left outer join post_parameters pp on p.path = pp.path "
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rows, err = appDb.QueryContext(context, query, config.limit, config.offset)
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} else {
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query := defaultSelection + defaultTables + defaultSorting
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rows, err = appDb.QueryContext(context, query)
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}
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if err != nil {
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return nil, err
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}
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defer func() {
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_ = rows.Close()
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}()
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for rows.Next() {
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post := &Post{}
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var parameterName, parameterValue string
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err = rows.Scan(&post.Path, &post.Content, &post.Published, &post.Updated, &post.Blog, &post.Section, ¶meterName, ¶meterValue)
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if err != nil {
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return nil, err
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}
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if paths[post.Path] == 0 {
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index := len(posts)
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paths[post.Path] = index + 1
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post.Parameters = make(map[string][]string)
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posts = append(posts, post)
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}
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if parameterName != "" && posts != nil {
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posts[paths[post.Path]-1].Parameters[parameterName] = append(posts[paths[post.Path]-1].Parameters[parameterName], parameterValue)
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}
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}
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return posts, nil
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}
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func countPosts(context context.Context, config *postsRequestConfig) (int, error) {
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posts, err := getPosts(context, config)
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return len(posts), err
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}
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func allPostPaths() ([]string, error) {
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var postPaths []string
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rows, err := appDb.Query("select path from posts")
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if err != nil {
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return nil, err
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}
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for rows.Next() {
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var path string
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_ = rows.Scan(&path)
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postPaths = append(postPaths, path)
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}
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return postPaths, nil
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}
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func allTaxonomyValues(blog string, taxonomy string) ([]string, error) {
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var values []string
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rows, err := appDb.Query("select distinct pp.value from posts p left outer join post_parameters pp on p.path = pp.path where pp.parameter = ? and length(coalesce(pp.value, '')) > 1 and blog = ?", taxonomy, blog)
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if err != nil {
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return nil, err
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}
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for rows.Next() {
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var value string
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_ = rows.Scan(&value)
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values = append(values, value)
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}
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return values, nil
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}
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