Added backend

backend/api/search.go

@@ -0,0 +1,81 @@
+package api
+
+import (
+	"TheAdversary/config"
+	"TheAdversary/database"
+	"TheAdversary/schema"
+	"encoding/json"
+	"net/http"
+	"path"
+	"strconv"
+	"strings"
+)
+
+func Search(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.Query()
+	request := database.GetDB().Table("article")
+
+	if query.Has("q") {
+		request.Where("LOWER(title) LIKE ?", "%"+query.Get("q")+"%")
+	}
+	if query.Has("from") {
+		from, err := strconv.ParseInt(query.Get("from"), 10, 64)
+		if err != nil {
+			ApiError{"invalid 'from' parameter", http.StatusUnprocessableEntity}.Send(w)
+			return
+		}
+		request.Where("created >= ?", from).Or("modified >= ?", from)
+	}
+	if query.Has("to") {
+		to, err := strconv.ParseInt(query.Get("to"), 10, 64)
+		if err != nil {
+			ApiError{"invalid 'to' parameter", http.StatusUnprocessableEntity}.Send(w)
+			return
+		}
+		request.Where("created <= ?", to).Or("modified <= ?", to)
+	}
+	if query.Has("authors") {
+		var authorIds []int
+		if err := json.NewDecoder(strings.NewReader(query.Get("authors"))).Decode(&authorIds); err != nil {
+			ApiError{"could not parse 'authors' parameter as array of integers / numbers", http.StatusUnprocessableEntity}.Send(w)
+			return
+		}
+		request.Where("id IN (?)", database.GetDB().Table("article_author").Select("article_id").Where("author_id IN (?)", authorIds))
+	}
+	if query.Has("tags") {
+		var tags []string
+		if err := json.NewDecoder(strings.NewReader(query.Get("tags"))).Decode(&tags); err != nil {
+			ApiError{"could not parse 'tags' parameter as array of strings", http.StatusUnprocessableEntity}.Send(w)
+			return
+		}
+		authorRequest := database.GetDB().Table("article_tag").Select("article_id").Where("tag IN ?", tags)
+		request.Where("id IN (?)", authorRequest)
+	}
+	limit := 20
+	if query.Has("limit") {
+		var err error
+		limit, err = strconv.Atoi(query.Get("limit"))
+		if err != nil {
+			ApiError{"invalid 'limit' parameter", http.StatusUnprocessableEntity}.Send(w)
+			return
+		} else if limit > 100 {
+			ApiError{"'limit' parameter must not be over 100", http.StatusUnprocessableEntity}.Send(w)
+			return
+		}
+	}
+	request.Limit(limit)
+
+	var articleSummaries []schema.ArticleSummary
+	request.Find(&articleSummaries)
+
+	for i, summary := range articleSummaries {
+		database.GetDB().Table("author").Where("id IN (?)", database.GetDB().Table("article_author").Select("author_id").Where("article_id = ?", summary.Id)).Find(&summary.Authors)
+		summary.Tags = []string{}
+		database.GetDB().Table("article_tag").Select("tag").Where("article_id = ?", summary.Id).Find(&summary.Tags)
+		summary.Link = path.Join(config.SubPath, "article", summary.Link)
+		articleSummaries[i] = summary
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(articleSummaries)
+}