Merge pull request 'dev' (#1) from dev into main

Reviewed-on: blahaj-fuckers/scrap#1
2025-10-05 08:09:46 +00:00
parent 1aa78d10c5 95d92312cc
commit d1ad10f40c
32 changed files with 1157 additions and 1 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.db
+tiles/
--- a/api/article/handler.go
+++ b/api/article/handler.go
@@ -0,0 +1,78 @@
+package article
+
+import (
+	"net/http"
+	"scrap/api/httpio"
+	"scrap/internal/article"
+	"scrap/internal/db"
+)
+
+func ArticleDownloadHandler(w http.ResponseWriter, r *http.Request) {
+	dbInstance := db.GetInstance()
+	txRepo := db.NewTxRepository(dbInstance)
+	articleRepo := article.NewArticleRepository()
+
+	service := article.NewArticleService(txRepo, articleRepo)
+	if err := service.DownloadArticles(); err != nil {
+		switch err {
+		default:
+			httpio.RaiseOnlyStatusCode(w, http.StatusInternalServerError)
+		}
+
+		return
+	}
+}
+
+func ArticleQueryHandler(w http.ResponseWriter, r *http.Request) {
+	body, err := httpio.ParseURLQuery[ArticleQueryRequest](
+		r,
+		httpio.URLQueryKey[string]("title"),
+	)
+	if err != nil {
+		httpio.RaiseOnlyStatusCode(w, http.StatusInternalServerError)
+		return
+	}
+
+	if httpErr := body.Validate(); httpErr != nil {
+		httpErr.Raise(w)
+		return
+	}
+
+	dbInstance := db.GetInstance()
+	txRepo := db.NewTxRepository(dbInstance)
+	articleRepo := article.NewArticleRepository()
+
+	service := article.NewArticleService(txRepo, articleRepo)
+
+	articleQueryData := article.ArticleQueryDTO{
+		Title: body.Title,
+	}
+
+	articles, err := service.QueryArticles(articleQueryData)
+	if err != nil {
+		switch err {
+		case article.ErrArticleTitleInvalidLength:
+			ErrHttpArticleTitleInvalidLength.Raise(w)
+		default:
+			httpio.RaiseOnlyStatusCode(w, http.StatusInternalServerError)
+		}
+
+		return
+	}
+
+	articlesOut := make([]ArticleResponse, 0, len(articles))
+	for _, a := range articles {
+		ar := ArticleResponse{
+			Uuid:    a.Uuid,
+			Title:   a.Title,
+			Content: a.Content,
+		}
+
+		articlesOut = append(articlesOut, ar)
+	}
+
+	if err = ArticleQueryResponse(articlesOut).Return(w, http.StatusOK); err != nil {
+		httpio.RaiseOnlyStatusCode(w, http.StatusInternalServerError)
+		return
+	}
+}
--- a/api/article/httperror.go
+++ b/api/article/httperror.go
@@ -0,0 +1,14 @@
+package article
+
+import (
+	"net/http"
+	"scrap/api/httpio"
+)
+
+var (
+	ErrHttpArticleTitleInvalidLength = httpio.HTTPError{
+		StatusCode: http.StatusBadRequest,
+		ErrorCode:  "ARTICLE_TITLE_LENGTH",
+		Message:    "Invalid title length.",
+	}
+)
--- a/api/article/request.go
+++ b/api/article/request.go
@@ -0,0 +1,16 @@
+package article
+
+import "scrap/api/httpio"
+
+type ArticleQueryRequest struct {
+	Title string `json:"title"`
+}
+
+func (a ArticleQueryRequest) Validate() *httpio.HTTPError {
+	titleLength := len(a.Title)
+	if titleLength < 1 || titleLength > 255 {
+		return &ErrHttpArticleTitleInvalidLength
+	}
+
+	return nil
+}
--- a/api/article/response.go
+++ b/api/article/response.go
@@ -0,0 +1,15 @@
+package article
+
+import "scrap/api/httpio"
+
+type ArticleResponse struct {
+	Uuid    string `json:"uuid"`
+	Title   string `json:"title"`
+	Content string `json:"content"`
+}
+
+func ArticleQueryResponse(articles []ArticleResponse) httpio.ResponseIO {
+	return httpio.ResponseIO{
+		"articles": articles,
+	}
+}
--- a/api/httpio/httperror.go
+++ b/api/httpio/httperror.go
@@ -0,0 +1,24 @@
+package httpio
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type HTTPError struct {
+	StatusCode int    `json:"-"`
+	ErrorCode  string `json:"error-code"`
+	Message    string `json:"message"`
+}
+
+func (h HTTPError) Raise(w http.ResponseWriter) {
+	jsonBytes, _ := json.Marshal(h)
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(h.StatusCode)
+	w.Write(jsonBytes)
+}
+
+func RaiseOnlyStatusCode(w http.ResponseWriter, code int) {
+	http.Error(w, "", code)
+}
--- a/api/httpio/request.go
+++ b/api/httpio/request.go
@@ -0,0 +1,38 @@
+package httpio
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"log"
+	"net/http"
+)
+
+type IRequestIO interface {
+	// Validates the received request.
+	Validate() *HTTPError
+}
+
+// Parses request body into the provided struct.
+// Throws an error if the body could not be parsed.
+func ParseRequestBody[T IRequestIO](r *http.Request) (*T, error) {
+	requestBytes, err := io.ReadAll(r.Body)
+	if err != nil {
+		log.Println(err.Error())
+		return nil, err
+	}
+
+	if !json.Valid(requestBytes) {
+		return nil, errors.New("invalid JSON format")
+	}
+
+	var req T
+	err = json.Unmarshal(requestBytes, &req)
+	if err != nil {
+		log.Println(err.Error())
+		return nil, err
+	}
+
+	return &req, nil
+
+}
--- a/api/httpio/response.go
+++ b/api/httpio/response.go
@@ -0,0 +1,21 @@
+package httpio
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type ResponseIO map[string]any
+
+func (r ResponseIO) Return(w http.ResponseWriter, statusCode int) error {
+	jsonBytes, err := json.Marshal(r)
+	if err != nil {
+		return err
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	w.Write(jsonBytes)
+
+	return nil
+}
--- a/api/httpio/urlquery.go
+++ b/api/httpio/urlquery.go
@@ -0,0 +1,86 @@
+package httpio
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+)
+
+type URLQueryValueType interface {
+	string | int | float32 | float64 | bool
+}
+
+type iURLQueryKeyType interface {
+	GetKey() string
+}
+
+type URLQueryKeyType[T URLQueryValueType] struct {
+	Key string
+	_   T
+}
+
+func (u URLQueryKeyType[T]) GetKey() string { return u.Key }
+
+func URLQueryKey[T URLQueryValueType](key string) iURLQueryKeyType {
+	return URLQueryKeyType[T]{
+		Key: key,
+	}
+}
+
+func ParseURLQuery[T IRequestIO](r *http.Request, keys ...iURLQueryKeyType) (*T, error) {
+	query := make(map[string]any, len(keys))
+
+	for _, key := range keys {
+		queryValue := r.URL.Query().Get(key.GetKey())
+
+		if queryValue == "" {
+			continue
+		}
+
+		switch key.(type) {
+		case URLQueryKeyType[string]:
+			query[key.GetKey()] = queryValue
+		case URLQueryKeyType[int]:
+			x, err := strconv.Atoi(queryValue)
+			if err != nil {
+				return nil, err
+			}
+
+			query[key.GetKey()] = x
+		case URLQueryKeyType[float32]:
+			x, err := strconv.ParseFloat(queryValue, 32)
+			if err != nil {
+				return nil, err
+			}
+
+			query[key.GetKey()] = x
+		case URLQueryKeyType[float64]:
+			x, err := strconv.ParseFloat(queryValue, 64)
+			if err != nil {
+				return nil, err
+			}
+
+			query[key.GetKey()] = x
+		case URLQueryKeyType[bool]:
+			x, err := strconv.ParseBool(queryValue)
+			if err != nil {
+				return nil, err
+			}
+
+			query[key.GetKey()] = x
+		default:
+			return nil, errors.New("unsupported URL query key type")
+		}
+	}
+
+	queryBytes, _ := json.Marshal(query)
+
+	var req T
+	err := json.Unmarshal(queryBytes, &req)
+	if err != nil {
+		return nil, err
+	}
+
+	return &req, nil
+}
--- a/api/setup.go
+++ b/api/setup.go
@@ -0,0 +1,18 @@
+package api
+
+import (
+	"net/http"
+	"scrap/api/article"
+
+	"github.com/go-chi/chi"
+)
+
+func Setup() {
+	r := chi.NewRouter()
+
+	r.Get("/articles", article.ArticleQueryHandler)
+	r.Get("/articles-download", article.ArticleDownloadHandler)
+	r.Handle("/tiles/", http.StripPrefix("/tiles/", http.FileServer(http.Dir("tiles"))))
+
+	http.ListenAndServe(":8080", r)
+}
--- a/cmd/serve/main.go
+++ b/cmd/serve/main.go
@@ -1,5 +1,22 @@
-package serve
+package main
+
+import (
+	"log"
+	"scrap/api"
+	"scrap/internal/config"
+	"scrap/internal/db"
+	"scrap/internal/osm"
+)

 func main() {
+	config.Setup()

+	db.Setup()
+	defer db.Close()
+
+	log.SetFlags(log.Lshortfile)
+
+	osm.OSM()
+
+	api.Setup()
 }
--- a/config.json
+++ b/config.json
@@ -0,0 +1,4 @@
+{
+    "sql-tables-dir": "./sqltable/",
+    "sql-database-name": "scrap.db"
+}
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,28 @@
 module scrap

 go 1.24.4
+
+require (
+	github.com/go-chi/chi v1.5.5
+	github.com/gocolly/colly v1.2.0
+	github.com/mattn/go-sqlite3 v1.14.32
+)
+
+require (
+	github.com/PuerkitoBio/goquery v1.10.3 // indirect
+	github.com/andybalholm/cascadia v1.3.3 // indirect
+	github.com/antchfx/htmlquery v1.3.4 // indirect
+	github.com/antchfx/xmlquery v1.4.4 // indirect
+	github.com/antchfx/xpath v1.3.5 // indirect
+	github.com/gobwas/glob v0.2.3 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/uuid v1.6.0 
+	github.com/kennygrant/sanitize v1.2.4 // indirect
+	github.com/saintfish/chardet v0.0.0-20230101081208-5e3ef4b5456d // indirect
+	github.com/temoto/robotstxt v1.1.2 // indirect
+	golang.org/x/net v0.44.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
+	google.golang.org/appengine v1.6.8 // indirect
+	google.golang.org/protobuf v1.36.10 // indirect
+)
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,121 @@
+github.com/PuerkitoBio/goquery v1.10.3 h1:pFYcNSqHxBD06Fpj/KsbStFRsgRATgnf3LeXiUkhzPo=
+github.com/PuerkitoBio/goquery v1.10.3/go.mod h1:tMUX0zDMHXYlAQk6p35XxQMqMweEKB7iK7iLNd4RH4Y=
+github.com/andybalholm/cascadia v1.3.3 h1:AG2YHrzJIm4BZ19iwJ/DAua6Btl3IwJX+VI4kktS1LM=
+github.com/andybalholm/cascadia v1.3.3/go.mod h1:xNd9bqTn98Ln4DwST8/nG+H0yuB8Hmgu1YHNnWw0GeA=
+github.com/antchfx/htmlquery v1.3.4 h1:Isd0srPkni2iNTWCwVj/72t7uCphFeor5Q8nCzj1jdQ=
+github.com/antchfx/htmlquery v1.3.4/go.mod h1:K9os0BwIEmLAvTqaNSua8tXLWRWZpocZIH73OzWQbwM=
+github.com/antchfx/xmlquery v1.4.4 h1:mxMEkdYP3pjKSftxss4nUHfjBhnMk4imGoR96FRY2dg=
+github.com/antchfx/xmlquery v1.4.4/go.mod h1:AEPEEPYE9GnA2mj5Ur2L5Q5/2PycJ0N9Fusrx9b12fc=
+github.com/antchfx/xpath v1.3.3/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
+github.com/antchfx/xpath v1.3.5 h1:PqbXLC3TkfeZyakF5eeh3NTWEbYl4VHNVeufANzDbKQ=
+github.com/antchfx/xpath v1.3.5/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
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--- a/internal/article/dto.go
+++ b/internal/article/dto.go
@@ -0,0 +1,11 @@
+package article
+
+type ArticleDTO struct {
+	Uuid    string
+	Title   string
+	Content string
+}
+
+type ArticleQueryDTO struct {
+	Title string
+}
--- a/internal/article/error.go
+++ b/internal/article/error.go
@@ -0,0 +1,12 @@
+package article
+
+import "errors"
+
+var (
+	ErrArticleDownloadFailed  = errors.New("article: download failed")
+	ErrArticleQueryFailed     = errors.New("article: article query failed")
+	ErrArticleCreateFailed    = errors.New("article: create failed")
+	ErrArticleDeleteAllFailed = errors.New("article: failed to delete all articles")
+
+	ErrArticleTitleInvalidLength = errors.New("article: invalid article length")
+)
--- a/internal/article/irepository.go
+++ b/internal/article/irepository.go
@@ -0,0 +1,9 @@
+package article
+
+import "database/sql"
+
+type IArticleRepository interface {
+	CreateArticle(tx *sql.Tx, data ArticleCreateModel) error
+	GetArticlesByTitle(tx *sql.Tx, title string) ([]ArticleModel, error)
+	DeleteAllArticles(tx *sql.Tx) error
+}
--- a/internal/article/iservice.go
+++ b/internal/article/iservice.go
@@ -0,0 +1,6 @@
+package article
+
+type IArticleService interface {
+	DownloadArticles() error
+	QueryArticles(ArticleQueryDTO) ([]ArticleDTO, error)
+}
--- a/internal/article/model.go
+++ b/internal/article/model.go
@@ -0,0 +1,13 @@
+package article
+
+type ArticleModel struct {
+	Uuid    string
+	Title   string
+	Content string
+}
+
+type ArticleCreateModel struct {
+	Uuid    string
+	Title   string
+	Content string
+}
--- a/internal/article/repository.go
+++ b/internal/article/repository.go
@@ -0,0 +1,60 @@
+package article
+
+import (
+	"database/sql"
+	"fmt"
+)
+
+type ArticleRepository struct{}
+
+func NewArticleRepository() IArticleRepository {
+	return &ArticleRepository{}
+}
+
+func (ArticleRepository) CreateArticle(tx *sql.Tx, data ArticleCreateModel) error {
+	query := `
+		INSERT INTO articles(uuid, title, content)
+		VALUES ($1, $2, $3);
+	`
+
+	_, err := tx.Exec(query, data.Uuid, data.Title, data.Content)
+	return err
+}
+
+func (ArticleRepository) GetArticlesByTitle(tx *sql.Tx, title string) ([]ArticleModel, error) {
+	fmt.Println(title, " ------------------")
+	query := `
+		SELECT uuid, title, content
+		FROM articles
+		WHERE title LIKE $1 || '%'
+		LIMIT 10;
+	`
+
+	rows, err := tx.Query(query, title)
+	if err != nil {
+		return nil, err
+	}
+
+	articles := []ArticleModel{}
+	for rows.Next() {
+		var a ArticleModel
+
+		err = rows.Scan(&a.Uuid, &a.Title, &a.Content)
+		if err != nil {
+			return nil, err
+		}
+
+		articles = append(articles, a)
+	}
+
+	fmt.Println(articles)
+
+	return articles, nil
+}
+
+func (ArticleRepository) DeleteAllArticles(tx *sql.Tx) error {
+	query := `DELETE FROM articles;`
+
+	_, err := tx.Exec(query)
+	return err
+}
--- a/internal/article/service.go
+++ b/internal/article/service.go
@@ -0,0 +1,107 @@
+package article
+
+import (
+	"log"
+	"scrap/internal/db"
+	"scrap/internal/wikipediadl"
+
+	"github.com/google/uuid"
+)
+
+type ArticleService struct {
+	txRepo      db.ITxRepository
+	articleRepo IArticleRepository
+}
+
+func NewArticleService(
+	txRepo db.ITxRepository,
+	articleRepo IArticleRepository,
+) IArticleService {
+	return &ArticleService{
+		txRepo:      txRepo,
+		articleRepo: articleRepo,
+	}
+}
+
+func (a ArticleService) QueryArticles(data ArticleQueryDTO) ([]ArticleDTO, error) {
+	tx, err := a.txRepo.Begin()
+	if err != nil {
+		log.Println(err.Error())
+		return nil, err
+	}
+
+	defer a.txRepo.RollbackOnError(tx, &err)
+
+	articleTitleLength := len(data.Title)
+	if articleTitleLength < 1 || articleTitleLength > 255 {
+		return nil, ErrArticleTitleInvalidLength
+	}
+
+	articles, err := a.articleRepo.GetArticlesByTitle(tx, data.Title)
+	if err != nil {
+		log.Println(err.Error())
+		return nil, ErrArticleQueryFailed
+	}
+
+	articlesOut := make([]ArticleDTO, 0, len(articles))
+	for _, am := range articles {
+		a := ArticleDTO{
+			Uuid:    am.Uuid,
+			Title:   am.Title,
+			Content: am.Content,
+		}
+
+		articlesOut = append(articlesOut, a)
+	}
+
+	return articlesOut, nil
+}
+
+func (a ArticleService) DownloadArticles() error {
+	tx, err := a.txRepo.Begin()
+	if err != nil {
+		log.Println(err.Error())
+		return db.ErrTxBeginFailed
+	}
+
+	defer a.txRepo.RollbackOnError(tx, &err)
+
+	if err = a.articleRepo.DeleteAllArticles(tx); err != nil {
+		log.Println(err.Error())
+		return ErrArticleDeleteAllFailed
+	}
+
+	articleBundles, err := wikipediadl.FetchArticleBundles()
+	if err != nil {
+		log.Println(err.Error())
+		return ErrArticleDownloadFailed
+	}
+
+	for _, ab := range articleBundles {
+		articles, err := wikipediadl.ExtractArticles(ab)
+		if err != nil {
+			log.Println(err.Error())
+			return ErrArticleDownloadFailed
+		}
+
+		for _, article := range articles {
+			articleData := ArticleCreateModel{
+				Uuid:    uuid.NewString(),
+				Title:   article.Title,
+				Content: article.Revision.Text,
+			}
+
+			if err = a.articleRepo.CreateArticle(tx, articleData); err != nil {
+				log.Println(err.Error(), "tutaj ---------")
+				continue
+			}
+		}
+	}
+
+	if err = a.txRepo.Commit(tx); err != nil {
+		log.Println(err.Error())
+		return db.ErrTxCommitFailed
+	}
+
+	return nil
+}
--- a/internal/config/setup.go
+++ b/internal/config/setup.go
@@ -0,0 +1,26 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type AppConfig struct {
+	SqlTablesDir    string `json:"sql-tables-dir"`
+	SqlDatabaseName string `json:"sql-database-name"`
+}
+
+var appConfigInstance *AppConfig
+
+func Setup() {
+	file, err := os.ReadFile("config.json")
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(file, &appConfigInstance); err != nil {
+		panic(err)
+	}
+}
+
+func GetAppConfig() *AppConfig { return appConfigInstance }
--- a/internal/db/error.go
+++ b/internal/db/error.go
@@ -0,0 +1,8 @@
+package db
+
+import "errors"
+
+var (
+	ErrTxBeginFailed  = errors.New("tx: could not begin a Tx")
+	ErrTxCommitFailed = errors.New("tx: could not commit the Tx")
+)
--- a/internal/db/irepository.go
+++ b/internal/db/irepository.go
@@ -0,0 +1,14 @@
+package db
+
+import "database/sql"
+
+type ITxRepository interface {
+	// Creates a new tx.
+	Begin() (*sql.Tx, error)
+
+	// Rollbacks tx's data or returns an error to the given error's pointer address.
+	RollbackOnError(*sql.Tx, *error)
+
+	// Applies changes to the database.
+	Commit(*sql.Tx) error
+}
--- a/internal/db/repository.go
+++ b/internal/db/repository.go
@@ -0,0 +1,34 @@
+package db
+
+import (
+	"database/sql"
+)
+
+type TxRepository struct {
+	db *sql.DB
+}
+
+func NewTxRepository(instance *sql.DB) ITxRepository {
+	return &TxRepository{
+		db: instance,
+	}
+}
+
+func (t TxRepository) Begin() (*sql.Tx, error) {
+	tx, err := t.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+
+	return tx, nil
+}
+
+func (TxRepository) RollbackOnError(tx *sql.Tx, errObserve *error) {
+	if *errObserve != nil {
+		tx.Rollback()
+	}
+}
+
+func (TxRepository) Commit(tx *sql.Tx) error {
+	return tx.Commit()
+}
--- a/internal/db/setup.go
+++ b/internal/db/setup.go
@@ -0,0 +1,67 @@
+package db
+
+import (
+	"database/sql"
+	"os"
+	"scrap/internal/config"
+	"strings"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+var dbInstance *sql.DB
+
+func Setup() {
+	cfg := config.GetAppConfig()
+
+	db, err := sql.Open("sqlite3", cfg.SqlDatabaseName)
+	if err != nil {
+		panic(err)
+	}
+
+	dbInstance = db
+
+	tableFilenames := getTableFilenames()
+	createTablesFromSQLFiles(tableFilenames)
+}
+
+func GetInstance() *sql.DB { return dbInstance }
+
+func Close() { dbInstance.Close() }
+
+func getTableFilenames() []string {
+	appConfig := config.GetAppConfig()
+
+	files, err := os.ReadDir(appConfig.SqlTablesDir)
+	if err != nil {
+		panic(err)
+	}
+
+	filenames := []string{}
+	for _, f := range files {
+		fName := f.Name()
+		if !strings.HasSuffix(fName, ".sql") {
+			continue
+		}
+
+		filenames = append(filenames, fName)
+	}
+
+	return filenames
+}
+
+func createTablesFromSQLFiles(filenames []string) {
+	appConfig := config.GetAppConfig()
+
+	for _, fName := range filenames {
+		tableBytes, err := os.ReadFile(appConfig.SqlTablesDir + fName)
+		if err != nil {
+			panic(err)
+		}
+
+		tableQuery := string(tableBytes)
+		if _, err = dbInstance.Exec(tableQuery); err != nil {
+			panic(err)
+		}
+	}
+}
--- a/internal/osm/osm.go
+++ b/internal/osm/osm.go
@@ -0,0 +1,152 @@
+package osm
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"math"
+	"net/http"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"sync"
+	"time"
+)
+
+var (
+	userLat  = 50.06465
+	userLon  = 19.94598
+	radiusM    = 2000.0
+	maxZoom    = 17
+	userAgent  = "krakow-tiles-downloader/1.0 (+your_email@example.com)"
+	osmTileURL = "https://tile.openstreetmap.org/%d/%d/%d.png"
+	tilesDir   = "tiles"
+)
+
+const earthRadius = 6378137.0
+
+func offsetLatLon(lat, lon, distance, bearingRad float64) (float64, float64) {
+	r := earthRadius
+	latRad := lat * math.Pi / 180.0
+	lonRad := lon * math.Pi / 180.0
+	angDist := distance / r
+	newLatRad := math.Asin(math.Sin(latRad)*math.Cos(angDist) + math.Cos(latRad)*math.Sin(angDist)*math.Cos(bearingRad))
+	newLonRad := lonRad + math.Atan2(math.Sin(bearingRad)*math.Sin(angDist)*math.Cos(latRad),
+		math.Cos(angDist)-math.Sin(latRad)*math.Sin(newLatRad))
+	return newLatRad * 180.0 / math.Pi, newLonRad * 180.0 / math.Pi
+}
+
+func boundingBoxForCircle(lat, lon, radius float64) (minLat, maxLat, minLon, maxLon float64) {
+	maxLat, _ = offsetLatLon(lat, lon, radius, 0)
+	minLat, _ = offsetLatLon(lat, lon, radius, math.Pi)
+	_, maxLon = offsetLatLon(lat, lon, radius, math.Pi/2)
+	_, minLon = offsetLatLon(lat, lon, radius, 3*math.Pi/2)
+	return
+}
+
+func latLonToTile(lat, lon float64, z int) (x, y int) {
+	latRad := lat * math.Pi / 180.0
+	n := math.Pow(2.0, float64(z))
+	xFloat := (lon + 180.0) / 360.0 * n
+	yFloat := (1.0 - math.Log(math.Tan(latRad)+1.0/math.Cos(latRad))/math.Pi) / 2.0 * n
+	return int(math.Floor(xFloat)), int(math.Floor(yFloat))
+}
+
+func tileXYBounds(minLat, maxLat, minLon, maxLon float64, z int) (minX, maxX, minY, maxY int) {
+	x1, y1 := latLonToTile(maxLat, minLon, z)
+	x2, y2 := latLonToTile(minLat, maxLon, z)
+	if x1 > x2 {
+		minX, maxX = x2, x1
+	} else {
+		minX, maxX = x1, x2
+	}
+	if y1 > y2 {
+		minY, maxY = y2, y1
+	} else {
+		minY, maxY = y1, y2
+	}
+	return
+}
+
+func downloadTile(ctx context.Context, z, x, y int) error {
+	url := fmt.Sprintf(osmTileURL, z, x, y)
+	req, _ := http.NewRequestWithContext(ctx, "GET", url, nil)
+	req.Header.Set("User-Agent", userAgent)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 429 || resp.StatusCode == 403 {
+		time.Sleep(5 * time.Second)
+		return nil
+	}
+	if resp.StatusCode != 200 {
+		return fmt.Errorf("HTTP %d for %s", resp.StatusCode, url)
+	}
+
+	tileCount := 1 << uint(z)
+	yFlipped := tileCount - 1 - y
+	path := filepath.Join(tilesDir, strconv.Itoa(z), strconv.Itoa(x))
+	if err := os.MkdirAll(path, 0o755); err != nil {
+		return err
+	}
+	filePath := filepath.Join(path, fmt.Sprintf("%d.png", yFlipped))
+	f, err := os.Create(filePath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = io.Copy(f, resp.Body)
+	return err
+}
+
+func downloadRange(ctx context.Context, z, minX, maxX, minY, maxY int) {
+	log.Printf("Downloading tiles zoom %d: x %d..%d, y %d..%d", z, minX, maxX, minY, maxY)
+	sem := make(chan struct{}, runtime.NumCPU())
+	var wg sync.WaitGroup
+	rate := time.NewTicker(1 * time.Second)
+	defer rate.Stop()
+
+	for x := minX; x <= maxX; x++ {
+		for y := minY; y <= maxY; y++ {
+			wg.Add(1)
+			sem <- struct{}{}
+			<-rate.C
+			go func(x, y int) {
+				defer wg.Done()
+				defer func() { <-sem }()
+				filePath := filepath.Join(tilesDir, strconv.Itoa(z), strconv.Itoa(x), fmt.Sprintf("%d.png", (1<<uint(z))-1-y))
+				if _, err := os.Stat(filePath); err == nil {
+					return
+				}
+				if err := downloadTile(ctx, z, x, y); err != nil {
+					log.Printf("Failed %d/%d/%d: %v", z, x, y, err)
+				}
+			}(x, y)
+		}
+	}
+	wg.Wait()
+}
+
+func runDownloader(ctx context.Context) error {
+	minLat, maxLat, minLon, maxLon := boundingBoxForCircle(userLat, userLon, radiusM)
+	minX, maxX, minY, maxY := tileXYBounds(minLat, maxLat, minLon, maxLon, maxZoom)
+	downloadRange(ctx, maxZoom, minX, maxX, minY, maxY)
+	return nil
+}
+
+func OSM(){
+	if err := os.MkdirAll(tilesDir, 0o755); err != nil {
+		log.Fatalf("failed to create tiles dir: %v", err)
+	}
+	ctx := context.Background()
+	go func() {
+		if err := runDownloader(ctx); err != nil {
+			log.Printf("Downloader finished with error: %v", err)
+		}
+	}()
+}
--- a/internal/wikipediadl/const.go
+++ b/internal/wikipediadl/const.go
@@ -0,0 +1,6 @@
+package wikipediadl
+
+const (
+	WikipediaDumpDomain = "dumps.wikimedia.org"
+	WikipediaDumpUrl    = "https://" + WikipediaDumpDomain + "/plwiki/latest/"
+)
--- a/internal/wikipediadl/error.go
+++ b/internal/wikipediadl/error.go
@@ -0,0 +1,8 @@
+package wikipediadl
+
+import "errors"
+
+var (
+	ErrArticleBundleFetchFailed = errors.New("wikipediadl: failed to fetch article bundles")
+	ErrArticleDownloadFailed    = errors.New("wikipediadl: failed to extract articles")
+)
--- a/internal/wikipediadl/extractarticles.go
+++ b/internal/wikipediadl/extractarticles.go
@@ -0,0 +1,75 @@
+package wikipediadl
+
+import (
+	"compress/bzip2"
+	"encoding/xml"
+	"errors"
+	"io"
+	"log"
+	"net/http"
+)
+
+type WikiArticle struct {
+	Title    string   `xml:"title"`
+	Revision Revision `xml:"revision"`
+}
+
+type Revision struct {
+	Text string `xml:"text"`
+}
+
+func ExtractArticles(bundle string) ([]WikiArticle, error) {
+	url := WikipediaDumpUrl + bundle
+
+	resp, err := http.Get(url)
+	if err != nil {
+		log.Println(err.Error())
+		return nil, errors.New("wikipediadl: failed load articles")
+	}
+
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, errors.New("wikipediadl: bad response status")
+	}
+
+	bz2Reader := bzip2.NewReader(resp.Body)
+	xmlDec := xml.NewDecoder(bz2Reader)
+
+	count := 0
+
+	articles := []WikiArticle{}
+Loop:
+	for {
+		tok, err := xmlDec.Token()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+
+			return nil, errors.New("XML token error")
+		}
+
+		switch se := tok.(type) {
+		case xml.StartElement:
+			if count == 2 { // XXX: remove later
+				break Loop
+			}
+
+			if se.Name.Local != "page" {
+				continue
+			}
+
+			var p WikiArticle
+			if err := xmlDec.DecodeElement(&p, &se); err != nil {
+				log.Println(err.Error())
+				continue
+			}
+
+			articles = append(articles, p)
+			count++ // XXX: remove later
+		}
+	}
+
+	return articles, nil
+}
--- a/internal/wikipediadl/fetcharticles.go
+++ b/internal/wikipediadl/fetcharticles.go
@@ -0,0 +1,64 @@
+package wikipediadl
+
+import (
+	"log"
+	"strings"
+
+	"github.com/gocolly/colly"
+)
+
+const (
+	DumpDomain = "dumps.wikimedia.org"
+	DumpUrl    = "https://dumps.wikimedia.org/plwiki/latest/"
+)
+
+func FetchArticleBundles() ([]string, error) {
+	scraper := getScraper()
+
+	articles := getAllArticles(scraper)
+	return articles, nil
+}
+
+func getScraper() *colly.Collector {
+	return colly.NewCollector(
+		colly.AllowedDomains(DumpDomain),
+	)
+}
+
+func getAllArticles(s *colly.Collector) []string {
+	articles := []string{}
+
+	s.OnHTML("a", func(h *colly.HTMLElement) {
+		article := h.Attr("href")
+		if !isValidArticle(article) {
+			return
+		}
+
+		articles = append(articles, h.Attr("href"))
+
+	})
+
+	s.OnError(func(r *colly.Response, err error) {
+		log.Println(r.Request.URL)
+	})
+
+	s.Visit(DumpUrl)
+
+	return articles
+}
+
+func isValidArticle(a string) bool {
+	const (
+		validPrefix = "plwiki-latest-pages-articles"
+		validSuffix = ".bz2"
+	)
+
+	if !strings.HasPrefix(a, validPrefix) || !strings.HasSuffix(a, validSuffix) {
+		return false
+	}
+
+	article, _ := strings.CutPrefix(a, validPrefix)
+
+	articleIndex := article[0]
+	return articleIndex >= 48 && articleIndex <= 57
+}
--- a/sqltable/1_articles.sql
+++ b/sqltable/1_articles.sql
@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS articles(
+    uuid CHAR(36) PRIMARY KEY,
+    title VARCHAR(255) NOT NULL,
+    content TEXT NOT NULL
+)